Reference:
https://docs.microsoft.com/en-us/microsoftteams/how-many-phone-numbers-can-you-get

Reference:
https://docs.microsoft.com/en-us/azure/active-directory/users-groups-roles/groups-naming-policy

According to the Microsoft documentation1, to generate a report that identifies which documents the users copied from Teams to USB devices, you need to use advanced hunting on Microsoft Defender ATP. Advanced hunting lets you run queries to find threat activity involving USB devices, such as mounting and unmounting of USB drives or copying of files2.
To use advanced hunting, you need to have one of the following roles:
Security administrator
Security reader
Security operator
Global administrator
The Groups Administrator role does not have access to advanced hunting or Microsoft Defender ATP.
Therefore, based on this information, the correct answer is B. Assign the Microsoft 365 E5 compliance add-on to each user. This add-on includes Microsoft Defender ATP and allows you to use advanced hunting features3. Alternatively, you can request one of the roles that have access to advanced hunting, such as Security administrator or Global administrator.

Reference:
https://docs.microsoft.com/en-us/microsoftteams/teams-custom-app-policies-and-settings#org-wide-custom-app-setting