Your network contains an Active Directory domain. The domain contains two domain
controllers named DC1 and DC2.
You perform a full backup of the domain controllers every night by using Windows Server
Backup.
You update a script in the SYSVOL folder.
You discover that the new script fails to run properly. You need to restore the previous
version of the script in the SYSVOL folder. The solution must minimize the amount of time
required to restore the script.
What should you do first?

A.
Run the Restore-ADObject cmdlet.

B.
Restore the system state to its original location.

C.
Restore the system state to an alternate location.

D.
Attach the VHD file created by Windows Server Backup.

Explanation:
http://technet.microsoft.com/en-us/magazine/2008.05.adbackup.aspx
Active Directory Backup and Restore in Windows Server 2008
NTBACKUP vs. Windows Server Backup

As an added bonus, Windows Server Backup stores its backup images in Microsoft® Virtual
Hard Disk (VHD) format. You can actually take a backup image and mount it as a volume in
a virtual machine running under Microsoft Virtual Server 2005. You can simply mount the
VHDs in a virtual machine and browse for a particular file rather than having to perform test
restores of tapes to see which one has the file is on it. (A note of caution: you can’t take a
backup image and boot a virtual machine from it. Since the backed-up hardware
configuration doesn’t correspond to the virtual machine’s configuration, you can’t use
Windows Server Backup as a physical-to-virtual migration tool.)