You are the network administrator for The network consists of a single Active Directory domain named The network contains 40 Windows Server 2003 computers. The functional level of the domain is Windows Server 2003. Four servers are configured as domain controllers. The information technology (IT) department has positions for three trainee network administrators. When their training period is complete, the trainees move the other roles, and new trainees are appointed. The trainee administrators are responsible for backing up and restoring all servers. TestKing.com's written security policy states that each trainee must have a unique user account. The trainees' domain user accounts are members of a global group named TraineeAdmins. You need to ensure that trainees have the required rights to log on locally, to shut down, and to backup and restore all servers. When new trainees are appointed, you need to assign their user accounts the required rights. What should you do?（）

Add the TraineeAdmins group to the Power Users group on each server.
B. Add the TraineeAdmins group to the Server Operators group on a domain controller.
C. Add the TraineeAdmins group to the Backup Operators group on each server.
D. Add the TraineeAdmins group to the Backup Operators group on a domain controller.