You are the network administrator for The network consists of a single Active Directory domain named that contains two domain controllers. The domain controllers run Windows Server 2003 and Certificate Services. Each domain controller has a single mirrored had disk that contains a single NTFS volume. You are responsible for backing up all servers. TestKing requirements state that backups must be performed only between the hours of 1:00 A.M. and 6:00 A.M. All servers share a single backup device. Because a large amount of data must be backed up, you need to complete the required backups as quickly as possible in order to complete the backups within the allotted time. You need to back up Active Directory and Certificate Services on the two domain controllers. The backup must include only the minimum amount of data necessary. Which action or actions should you perform? （）(Choose all that apply)

A. Perform a backup of the System State by using the Backup utility.
B. Perform a shadow copy backup of the C:\Windows\Ntds folder by using the Backup utility.
C. Perform a shadow copy backup of the C:\Windows\Sysvol folder by using the Backup utility.
D. Perform a shadow copy of the C:\Windows\System32\Certsrv folder by using the Backup utility