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MB-820 Premium File: 131 Questions & Answers

Last Update: Oct 12, 2026

MB-820 PDF Study Guide: 948 Pages

$74.99

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Microsoft MB-820 Practice Test 5

Question 40

A regional retailer wants a safe trial of an AL extension without exposing its live accounting company to a risky publish. A targeted trial still reproduces the original gap after the team attempted this change: Use a Business Central sandbox environment for isolated development and regression validation. Which repair directly addresses the remaining defect?

  1. Point the AL launch configuration to the intended sandbox and stop testing experimental packages against production
  2. Update the app dependency and affected AL calls for the target supported version, then retest in sandbox
  3. Remove the base-object modification and reimplement the customization with supported extension points
  4. Replace the unsupported database or host dependency with supported service APIs and an external integration component

Explanation

Correct Answer

A:

Point the AL launch configuration to the intended sandbox and stop testing experimental packages against production. This directly addresses the remaining defect for the requirement—A regional retailer wants a safe trial of an AL extension without exposing its live accounting company to a risky publish. It restores the mechanism described here: companies partition business data within an environment; a sandbox is an environment designed for testing changes away from production.

Incorrect Answers

B:

This correction is for the separate condition: A logistics team has an AL add-on with an obsolete dependency and an upcoming service update. It would not directly restore the intended behavior in this situation: A regional retailer wants a safe trial of an AL extension without exposing its live accounting company to a risky publish. Here, point the al launch configuration to the intended sandbox and stop testing experimental packages against production, because companies partition business data within an environment; a sandbox is an environment designed for testing changes away from production.

C:

This correction is for the separate condition: A medical wholesaler needs to record regulatory classifications on Item records while keeping the standard application upgradeable. It would not directly restore the intended behavior in this situation: A regional retailer wants a safe trial of an AL extension without exposing its live accounting company to a risky publish. Here, point the al launch configuration to the intended sandbox and stop testing experimental packages against production, because companies partition business data within an environment; a sandbox is an environment designed for testing changes away from production.

D:

This correction is for the separate condition: A finance integrator assumes it can install arbitrary operating-system services on Microsoft's hosted Business Central instance. It would not directly restore the intended behavior in this situation: A regional retailer wants a safe trial of an AL extension without exposing its live accounting company to a risky publish. Here, point the al launch configuration to the intended sandbox and stop testing experimental packages against production, because companies partition business data within an environment; a sandbox is an environment designed for testing changes away from production.

Question 41

An acquired tenant uses a base application upgrade to add statutory fields, while a custom report depends on the old object signature. Which single AL development or architecture change best resolves this requirement without redesigning unrelated workflows?

  1. Implement the additional data and behavior in a separate AL extension using appropriate extension objects
  2. Design the integration around supported Business Central APIs and the boundaries of online hosting
  3. Identify extension dependencies and supported application/runtime compatibility before upgrade
  4. Establish sandbox regression and compatibility checks before promoting the app version

Explanation

Correct Answer

C:

This targets the concrete requirement—An acquired tenant uses a base application upgrade to add statutory fields, while a custom report depends on the old object signature. The extension's referenced app versions and platform symbols determine what it can compile and run against. The team can establish success when symbol resolution and sandbox compilation succeed using the target Business Central app dependencies.

Incorrect Answers

A:

This choice primarily fits a different requirement: A distributor needs a freight-zone attribute on Customer records but must survive monthly SaaS upgrades without editing Microsoft tables. There, an extension composes with Microsoft application objects without requiring direct modifications to the shipped base objects. In the current situation, An acquired tenant uses a base application upgrade to add statutory fields, while a custom report depends on the old object signature. The extension's referenced app versions and platform symbols determine what it can compile and run against. Acceptance requires symbol resolution and sandbox compilation succeed using the target Business Central app dependencies.

B:

This choice primarily fits a different requirement: A SaaS retailer is asking for direct SQL access to inspect Business Central transaction tables every night. There, Microsoft operates the SaaS infrastructure; tenants cannot treat the online service as a self-managed SQL server or operating-system host. In the current situation, An acquired tenant uses a base application upgrade to add statutory fields, while a custom report depends on the old object signature. The extension's referenced app versions and platform symbols determine what it can compile and run against. Acceptance requires symbol resolution and sandbox compilation succeed using the target Business Central app dependencies.

D:

This choice primarily fits a different requirement: An extension contains a warehouse valuation routine that will run during the next automatic Business Central update. There, Business Central updates the application platform while tenant extensions must remain compatible with supported al and dependent objects. In the current situation, An acquired tenant uses a base application upgrade to add statutory fields, while a custom report depends on the old object signature. The extension's referenced app versions and platform symbols determine what it can compile and run against. Acceptance requires symbol resolution and sandbox compilation succeed using the target Business Central app dependencies.

Question 42

An acquired tenant uses a base application upgrade to add statutory fields, while a custom report depends on the old object signature. The developer recommends the following change: Identify extension dependencies and supported application/runtime compatibility before upgrade. Which technical explanation most directly justifies it in this case?

  1. An extension composes with Microsoft application objects without requiring direct modifications to the shipped base objects
  2. Microsoft operates the SaaS infrastructure; tenants cannot treat the online service as a self-managed SQL Server or operating-system host
  3. Business Central updates the application platform while tenant extensions must remain compatible with supported AL and dependent objects
  4. The extension's referenced app versions and platform symbols determine what it can compile and run against

Explanation

Correct Answer

D:

The extension's referenced app versions and platform symbols determine what it can compile and run against. It connects the proposed action to the exact failure or requirement—An acquired tenant uses a base application upgrade to add statutory fields, while a custom report depends on the old object signature. Confirmation would be symbol resolution and sandbox compilation succeed using the target Business Central app dependencies.

Incorrect Answers

A:

That mechanism explains why the alternative action—implement the additional data and behavior in a separate al extension using appropriate extension objects—helps in another case. It does not justify the proposed fix here; the extension's referenced app versions and platform symbols determine what it can compile and run against. The distinguishing requirement is: An acquired tenant uses a base application upgrade to add statutory fields, while a custom report depends on the old object signature.

B:

That mechanism explains why the alternative action—design the integration around supported Business Central apis and the boundaries of online hosting—helps in another case. It does not justify the proposed fix here; the extension's referenced app versions and platform symbols determine what it can compile and run against. The distinguishing requirement is: An acquired tenant uses a base application upgrade to add statutory fields, while a custom report depends on the old object signature.

C:

That mechanism explains why the alternative action—establish sandbox regression and compatibility checks before promoting the app version—helps in another case. It does not justify the proposed fix here; the extension's referenced app versions and platform symbols determine what it can compile and run against. The distinguishing requirement is: An acquired tenant uses a base application upgrade to add statutory fields, while a custom report depends on the old object signature.

Question 43

An acquired tenant uses a base application upgrade to add statutory fields, while a custom report depends on the old object signature. The team implemented a change aligned with this plan: Identify extension dependencies and supported application/runtime compatibility before upgrade. Which acceptance result specifically verifies that the reported problem is resolved?

  1. Symbol resolution and sandbox compilation succeed using the target Business Central app dependencies
  2. A sandbox upgrade completes and the new field and its behavior remain intact without editing base application source
  3. The integration retrieves the needed records through an authenticated supported endpoint without database or server access
  4. An updated sandbox runs the compatibility suite and passes transaction and permission regression tests before production rollout

Explanation

Correct Answer

A:

Symbol resolution and sandbox compilation succeed using the target Business Central app dependencies. This is stronger than an unrelated health check because the desired design action is identify extension dependencies and supported application/runtime compatibility before upgrade, and the extension's referenced app versions and platform symbols determine what it can compile and run against. The local requirement is: An acquired tenant uses a base application upgrade to add statutory fields, while a custom report depends on the old object signature.

Incorrect Answers

B:

This would verify implement the additional data and behavior in a separate al extension using appropriate extension objects, which addresses a different engineering need. It does not demonstrate that the current issue is resolved: An acquired tenant uses a base application upgrade to add statutory fields, while a custom report depends on the old object signature. The decisive local proof is symbol resolution and sandbox compilation succeed using the target Business Central app dependencies.

C:

This would verify design the integration around supported Business Central apis and the boundaries of online hosting, which addresses a different engineering need. It does not demonstrate that the current issue is resolved: An acquired tenant uses a base application upgrade to add statutory fields, while a custom report depends on the old object signature. The decisive local proof is symbol resolution and sandbox compilation succeed using the target Business Central app dependencies.

D:

This would verify establish sandbox regression and compatibility checks before promoting the app version, which addresses a different engineering need. It does not demonstrate that the current issue is resolved: An acquired tenant uses a base application upgrade to add statutory fields, while a custom report depends on the old object signature. The decisive local proof is symbol resolution and sandbox compilation succeed using the target Business Central app dependencies.

Question 44

An acquired tenant uses a base application upgrade to add statutory fields, while a custom report depends on the old object signature. A targeted trial still reproduces the original gap after the team attempted this change: Identify extension dependencies and supported application/runtime compatibility before upgrade. Which repair directly addresses the remaining defect?

  1. Remove the base-object modification and reimplement the customization with supported extension points
  2. Update the app dependency and affected AL calls for the target supported version, then retest in sandbox
  3. Replace the unsupported database or host dependency with supported service APIs and an external integration component
  4. Resolve deprecated API or dependency failures in the extension and rerun the upgrade compatibility tests

Explanation

Correct Answer

B:

Update the app dependency and affected AL calls for the target supported version, then retest in sandbox. This directly addresses the remaining defect for the requirement—An acquired tenant uses a base application upgrade to add statutory fields, while a custom report depends on the old object signature. It restores the mechanism described here: the extension's referenced app versions and platform symbols determine what it can compile and run against.

Incorrect Answers

A:

This correction is for the separate condition: A medical wholesaler needs to record regulatory classifications on Item records while keeping the standard application upgradeable. It would not directly restore the intended behavior in this situation: An acquired tenant uses a base application upgrade to add statutory fields, while a custom report depends on the old object signature. Here, update the app dependency and affected al calls for the target supported version, then retest in sandbox, because the extension's referenced app versions and platform symbols determine what it can compile and run against.

C:

This correction is for the separate condition: A finance integrator assumes it can install arbitrary operating-system services on Microsoft's hosted Business Central instance. It would not directly restore the intended behavior in this situation: An acquired tenant uses a base application upgrade to add statutory fields, while a custom report depends on the old object signature. Here, update the app dependency and affected al calls for the target supported version, then retest in sandbox, because the extension's referenced app versions and platform symbols determine what it can compile and run against.

D:

This correction is for the separate condition: A subscription accounting add-on must be compatible with future standard application releases in a managed environment. It would not directly restore the intended behavior in this situation: An acquired tenant uses a base application upgrade to add statutory fields, while a custom report depends on the old object signature. Here, update the app dependency and affected al calls for the target supported version, then retest in sandbox, because the extension's referenced app versions and platform symbols determine what it can compile and run against.

Question 45

A logistics team has an AL add-on with an obsolete dependency and an upcoming service update. Which single AL development or architecture change best resolves this requirement without redesigning unrelated workflows?

  1. Implement the additional data and behavior in a separate AL extension using appropriate extension objects
  2. Design the integration around supported Business Central APIs and the boundaries of online hosting
  3. Establish sandbox regression and compatibility checks before promoting the app version
  4. Identify extension dependencies and supported application/runtime compatibility before upgrade

Explanation

Correct Answer

D:

This targets the concrete requirement—A logistics team has an AL add-on with an obsolete dependency and an upcoming service update. The extension's referenced app versions and platform symbols determine what it can compile and run against. The team can establish success when symbol resolution and sandbox compilation succeed using the target Business Central app dependencies.

Incorrect Answers

A:

This choice primarily fits a different requirement: A distributor needs a freight-zone attribute on Customer records but must survive monthly SaaS upgrades without editing Microsoft tables. There, an extension composes with Microsoft application objects without requiring direct modifications to the shipped base objects. In the current situation, A logistics team has an AL add-on with an obsolete dependency and an upcoming service update. The extension's referenced app versions and platform symbols determine what it can compile and run against. Acceptance requires symbol resolution and sandbox compilation succeed using the target Business Central app dependencies.

B:

This choice primarily fits a different requirement: A SaaS retailer is asking for direct SQL access to inspect Business Central transaction tables every night. There, Microsoft operates the SaaS infrastructure; tenants cannot treat the online service as a self-managed SQL server or operating-system host. In the current situation, A logistics team has an AL add-on with an obsolete dependency and an upcoming service update. The extension's referenced app versions and platform symbols determine what it can compile and run against. Acceptance requires symbol resolution and sandbox compilation succeed using the target Business Central app dependencies.

C:

This choice primarily fits a different requirement: An extension contains a warehouse valuation routine that will run during the next automatic Business Central update. There, Business Central updates the application platform while tenant extensions must remain compatible with supported al and dependent objects. In the current situation, A logistics team has an AL add-on with an obsolete dependency and an upcoming service update. The extension's referenced app versions and platform symbols determine what it can compile and run against. Acceptance requires symbol resolution and sandbox compilation succeed using the target Business Central app dependencies.

Question 46

A logistics team has an AL add-on with an obsolete dependency and an upcoming service update. The developer recommends the following change: Identify extension dependencies and supported application/runtime compatibility before upgrade. Which technical explanation most directly justifies it in this case?

  1. The extension's referenced app versions and platform symbols determine what it can compile and run against
  2. An extension composes with Microsoft application objects without requiring direct modifications to the shipped base objects
  3. Microsoft operates the SaaS infrastructure; tenants cannot treat the online service as a self-managed SQL Server or operating-system host
  4. Business Central updates the application platform while tenant extensions must remain compatible with supported AL and dependent objects

Explanation

Correct Answer

A:

The extension's referenced app versions and platform symbols determine what it can compile and run against. It connects the proposed action to the exact failure or requirement—A logistics team has an AL add-on with an obsolete dependency and an upcoming service update. Confirmation would be symbol resolution and sandbox compilation succeed using the target Business Central app dependencies.

Incorrect Answers

B:

That mechanism explains why the alternative action—implement the additional data and behavior in a separate al extension using appropriate extension objects—helps in another case. It does not justify the proposed fix here; the extension's referenced app versions and platform symbols determine what it can compile and run against. The distinguishing requirement is: A logistics team has an AL add-on with an obsolete dependency and an upcoming service update.

C:

That mechanism explains why the alternative action—design the integration around supported Business Central apis and the boundaries of online hosting—helps in another case. It does not justify the proposed fix here; the extension's referenced app versions and platform symbols determine what it can compile and run against. The distinguishing requirement is: A logistics team has an AL add-on with an obsolete dependency and an upcoming service update.

D:

That mechanism explains why the alternative action—establish sandbox regression and compatibility checks before promoting the app version—helps in another case. It does not justify the proposed fix here; the extension's referenced app versions and platform symbols determine what it can compile and run against. The distinguishing requirement is: A logistics team has an AL add-on with an obsolete dependency and an upcoming service update.

Question 47

A logistics team has an AL add-on with an obsolete dependency and an upcoming service update. The team implemented a change aligned with this plan: Identify extension dependencies and supported application/runtime compatibility before upgrade. Which acceptance result specifically verifies that the reported problem is resolved?

  1. A sandbox upgrade completes and the new field and its behavior remain intact without editing base application source
  2. Symbol resolution and sandbox compilation succeed using the target Business Central app dependencies
  3. The integration retrieves the needed records through an authenticated supported endpoint without database or server access
  4. An updated sandbox runs the compatibility suite and passes transaction and permission regression tests before production rollout

Explanation

Correct Answer

B:

Symbol resolution and sandbox compilation succeed using the target Business Central app dependencies. This is stronger than an unrelated health check because the desired design action is identify extension dependencies and supported application/runtime compatibility before upgrade, and the extension's referenced app versions and platform symbols determine what it can compile and run against. The local requirement is: A logistics team has an AL add-on with an obsolete dependency and an upcoming service update.

Incorrect Answers

A:

This would verify implement the additional data and behavior in a separate al extension using appropriate extension objects, which addresses a different engineering need. It does not demonstrate that the current issue is resolved: A logistics team has an AL add-on with an obsolete dependency and an upcoming service update. The decisive local proof is symbol resolution and sandbox compilation succeed using the target Business Central app dependencies.

C:

This would verify design the integration around supported Business Central apis and the boundaries of online hosting, which addresses a different engineering need. It does not demonstrate that the current issue is resolved: A logistics team has an AL add-on with an obsolete dependency and an upcoming service update. The decisive local proof is symbol resolution and sandbox compilation succeed using the target Business Central app dependencies.

D:

This would verify establish sandbox regression and compatibility checks before promoting the app version, which addresses a different engineering need. It does not demonstrate that the current issue is resolved: A logistics team has an AL add-on with an obsolete dependency and an upcoming service update. The decisive local proof is symbol resolution and sandbox compilation succeed using the target Business Central app dependencies.

Question 48

A logistics team has an AL add-on with an obsolete dependency and an upcoming service update. A targeted trial still reproduces the original gap after the team attempted this change: Identify extension dependencies and supported application/runtime compatibility before upgrade. Which repair directly addresses the remaining defect?

  1. Remove the base-object modification and reimplement the customization with supported extension points
  2. Replace the unsupported database or host dependency with supported service APIs and an external integration component
  3. Update the app dependency and affected AL calls for the target supported version, then retest in sandbox
  4. Resolve deprecated API or dependency failures in the extension and rerun the upgrade compatibility tests

Explanation

Correct Answer

C:

Update the app dependency and affected AL calls for the target supported version, then retest in sandbox. This directly addresses the remaining defect for the requirement—A logistics team has an AL add-on with an obsolete dependency and an upcoming service update. It restores the mechanism described here: the extension's referenced app versions and platform symbols determine what it can compile and run against.

Incorrect Answers

A:

This correction is for the separate condition: A medical wholesaler needs to record regulatory classifications on Item records while keeping the standard application upgradeable. It would not directly restore the intended behavior in this situation: A logistics team has an AL add-on with an obsolete dependency and an upcoming service update. Here, update the app dependency and affected al calls for the target supported version, then retest in sandbox, because the extension's referenced app versions and platform symbols determine what it can compile and run against.

B:

This correction is for the separate condition: A finance integrator assumes it can install arbitrary operating-system services on Microsoft's hosted Business Central instance. It would not directly restore the intended behavior in this situation: A logistics team has an AL add-on with an obsolete dependency and an upcoming service update. Here, update the app dependency and affected al calls for the target supported version, then retest in sandbox, because the extension's referenced app versions and platform symbols determine what it can compile and run against.

D:

This correction is for the separate condition: A subscription accounting add-on must be compatible with future standard application releases in a managed environment. It would not directly restore the intended behavior in this situation: A logistics team has an AL add-on with an obsolete dependency and an upcoming service update. Here, update the app dependency and affected al calls for the target supported version, then retest in sandbox, because the extension's referenced app versions and platform symbols determine what it can compile and run against.

Question 49

A project team claims a low-level file and authentication utility belongs in the Base Application business processes. Which single AL development or architecture change best resolves this requirement without redesigning unrelated workflows?

  1. Distinguish the System Application shared framework from the Base Application business functionality
  2. Declare the dependent application in app.json and install compatible prerequisites before publishing
  3. Follow the Microsoft marketplace technical validation and submission process for the packaged app
  4. Plan the app's upgrade and data-migration lifecycle together with its versioned release

Explanation

Correct Answer

A:

This targets the concrete requirement—A project team claims a low-level file and authentication utility belongs in the Base Application business processes. System Application provides reusable system-level abstractions while Base Application supplies business-domain application behavior. The team can establish success when dependency review locates the framework functionality in the system library and business workflows in the base app.

Incorrect Answers

B:

This choice primarily fits a different requirement: A publisher's extension requires another vendor app but its manifest does not declare that dependency. There, extension package dependencies describe required apps and supported versions for symbol resolution and runtime availability. In the current situation, A project team claims a low-level file and authentication utility belongs in the Base Application business processes. System Application provides reusable system-level abstractions while Base Application supplies business-domain application behavior. Acceptance requires dependency review locates the framework functionality in the system library and business workflows in the base app.

C:

This choice primarily fits a different requirement: A partner is packaging an extension for broad marketplace sale without publishing privacy and functional support details. There, publishing a local app package does not fulfill the marketplace's validation, policy, listing, and lifecycle requirements. In the current situation, A project team claims a low-level file and authentication utility belongs in the Base Application business processes. System Application provides reusable system-level abstractions while Base Application supplies business-domain application behavior. Acceptance requires dependency review locates the framework functionality in the system library and business workflows in the base app.

D:

This choice primarily fits a different requirement: A Business Central app update introduces a new data model but has no migration path for old subscription records. There, extension upgrades must preserve and transform existing data rather than assuming a fresh installation on each new version. In the current situation, A project team claims a low-level file and authentication utility belongs in the Base Application business processes. System Application provides reusable system-level abstractions while Base Application supplies business-domain application behavior. Acceptance requires dependency review locates the framework functionality in the system library and business workflows in the base app.

Question 50

A project team claims a low-level file and authentication utility belongs in the Base Application business processes. The developer recommends the following change: Distinguish the System Application shared framework from the Base Application business functionality. Which technical explanation most directly justifies it in this case?

  1. Extension package dependencies describe required apps and supported versions for symbol resolution and runtime availability
  2. System Application provides reusable system-level abstractions while Base Application supplies business-domain application behavior
  3. Publishing a local app package does not fulfill the marketplace's validation, policy, listing, and lifecycle requirements
  4. Extension upgrades must preserve and transform existing data rather than assuming a fresh installation on each new version

Explanation

Correct Answer

B:

System Application provides reusable system-level abstractions while Base Application supplies business-domain application behavior. It connects the proposed action to the exact failure or requirement—A project team claims a low-level file and authentication utility belongs in the Base Application business processes. Confirmation would be dependency review locates the framework functionality in the system library and business workflows in the base app.

Incorrect Answers

A:

That mechanism explains why the alternative action—declare the dependent application in app.json and install compatible prerequisites before publishing—helps in another case. It does not justify the proposed fix here; system application provides reusable system-level abstractions while base application supplies business-domain application behavior. The distinguishing requirement is: A project team claims a low-level file and authentication utility belongs in the Base Application business processes.

C:

That mechanism explains why the alternative action—follow the Microsoft marketplace technical validation and submission process for the packaged app—helps in another case. It does not justify the proposed fix here; system application provides reusable system-level abstractions while base application supplies business-domain application behavior. The distinguishing requirement is: A project team claims a low-level file and authentication utility belongs in the Base Application business processes.

D:

That mechanism explains why the alternative action—plan the app's upgrade and data-migration lifecycle together with its versioned release—helps in another case. It does not justify the proposed fix here; system application provides reusable system-level abstractions while base application supplies business-domain application behavior. The distinguishing requirement is: A project team claims a low-level file and authentication utility belongs in the Base Application business processes.


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