You have a single Active Directory directory service domain. You back up your domain controllers on a nightly basis. An organizational unit （OU） is accidently deleted. You need to restore the objects that were located in the OU.  What should you do？（）

• A、 Perform a nonauthoritative restore of the domain controller.
• B、 Perform an authoritative restore of the domain controller.
• C、 Restore the system state data on the domain controller.
• D、 Restore the system volume on the domain controller.