Explanation/Reference:
Explanation:
A: Address book policies (ABPs) allow you to segment users into specific groups to provide customized views of your organization's global address list (GAL).
When creating an ABP, you assign a GAL, an offline address book (OAB), a room list, and one or more address lists to the policy.
You can then assign the ABP to mailbox users, providing them with access to a customized GAL in Outlook and Outlook Web App.
The goal is to provide a simpler mechanism to accomplish GAL segmentation for on-premises organizations that require multiple GALs.
D: After you create an address book policy (ABP), you must assign it to mailbox users. Users aren't assigned a default ABP when their user account is created.
If you don't assign an ABP to a user, the global address list (GAL) for your entire organization will be accessible to the user through Outlook and Outlook Web App.
This example assigns the ABP All Fabrikam to the existing mailbox user [email protected].
Set-Mailbox -Identity [email protected] -AddressBookPolicy "All Fabrikam"