You are the network administrator for . The network consists of a single Active Directory domain named All network servers run Windows Server 2003. All client computers run Windows XP Professional. Multiple users share the same client computer. A server named TestKing2 functions as a file and print server. You set the profile path for all user accounts to \\TestKing2\Profiles\username. Some domain users were added to the local Administrators group on the Windows XP Professional computers. A user reports that other users can log on to client computers that he has previously used and gain access to files stored in his My Documents folder on the local hard disk. You need to permanently prevent users from being able to access the My Documents folder of other domain users on the client computers. What should you do?（）

A. In Active Directory, modify the Default Domain Policy. Disable the Do not check for user ownership of Roaming Profile Folders setting.
B. In Active Directory, modify the Default Domain Policy. Enable the Delete cached copies of roaming profiles setting.
C. Log on to all client computers and delete all user profiles from the local hard disks.
D. Log on to all client computers and configure the Number of previous logons to cache setting to 0.