An administrator is configuring a Group Policy Object (GPO) for an Organizational Unit (OU) that contains virtual Windows 7 desktops. The administrator needs
several user settings to apply only to users accessing desktops in this OU.
After configuring the GPO, the administrator notices that the group policy user settings are not being applied.
Why are the user settings not being applied?

A.
The Loopback processing GPO setting was not enabled on the Computers OU.

B.
The OU does not contain both User and Computer objects.

C.
The Windows 7 desktops were not restarted after GPO was configured.

D.
The user settings must also be applied to the default Users OU.