[单项选择] Maria has been set up as an assistant to the administrator. Users of your network are complaining that Maria has been opening their files and editing them. She needs to perform backups and installations of programs, and setting up of printers.   How do you fix the problem with the minimum amount of effort, yet allowing her to accomplish the assigned tasks? （）
A. Remove her Administrator privilege and give her Power Users and Backup Operators.
B. Leave her as Administrator and make deny on Users’ files.
C. Remove her administrator privileges and assign her Server Operators.
D. Remove her administrator privileges and assign her Power Users and Replicator. 
E. Tell her that she isn’t allowed to tamper with other users files.