You recently upgraded all Windows NT Workstation 4.0 computers to Windows 2000 Professional. You want to give a new employee named Maria the ability to back up files, share resources, and install programs on a client computer that she shares with other users. You do not want Maria to be able to read other users’ files. What should you do to accomplish these goals?（）

Add Maria’s user account to the system group.
B. Add Maria’s user account to the interactive group.
C. Add Maria’s user account to the power user group.
D. Add Maria’s user account to the administrators group.
E. Add Maria’s user account to the Backup Operators group.