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.