You are the network administrator for The network consists of a single Active Directory domain named All network servers run Windows Server 2003. You are responsible for defining the procedures for backing up and restoring all servers. TestKing uses the Backup utility. To enhance security, The IT department deploys certificates to all network users. Smart cards will be required to log on to the domain. A domain controller named TestKingDC1 is configured as the certificate server. You need to create a backup plan for TestKingDC1. The backup must include only the minimum amount of data needed to restore Active Directory and the certificate server. Which action or actions should you perform? （）(Choose all that apply)

A. Back up the System State data.
Back up C:\windows\ntds.
C. Back up C:\windows\sysvol.
D. Back up C:\windows\system32\certsrv.