When a Dynamics 365 Business Central extension is installed for the first time, the system records two key version values. The AppVersion is taken directly from the version property in the extension's app.json manifest file (e.g., 1.0.0.1). Concurrently, the DataVersion is initialized to a special value of 0.0.0.0. This specific DataVersion indicates that the extension's data structure is at its base state and no data upgrade has been executed yet. Evaluating this state is crucial for deciding to run the initial upgrade process.

B. AppVersion = 1.0.0.2: While a valid version number, it represents a subsequent version, not the initial state typically associated with a DataVersion of 0.0.0.0.
D. DataVersion = 1.0.0.1: This value indicates that a data upgrade has already been successfully completed, so it would not be the initial value obtained upon first installation.
E. DataVersion = 1.0.0.2: Similar to option D, this represents a data version after a subsequent upgrade and is not the initial state.

1. Microsoft Dynamics 365 Business Central Documentation, "Upgrading Extensions": "The data version of the extension is stored per-tenant. The initial data version is 0.0.0.0. When you run the upgrade, the data version of the currently installed extension is checked. If the data version is lower than the version of the new extension, the upgrade code is run." (See the section on "The Upgrade Process").

2. Microsoft Dynamics 365 Business Central Documentation, "JSON Files": "The version property is the version of your extension. The version is used for upgrade purposes... The version has the format major.minor.build.revision." This property in the app.json file defines the value that becomes the AppVersion. (See the section on "app.json file").