What should you identify?

You are employed as the systems administrator at Domain.com. The Domain.com network consists of a single Active Directory domain named Domain.com. All servers on the Domain.com network run Windows Server 2008 and all client computers run Windows Vista.
At present the operating system is booted using the Directory Services Restore mode. During the course of the day you attempt to log in using a Domain administrator account but are unable to do so. You need to determine the reason why you are unable to log in.
What should you identify?

A.
You are unable to log in because the Active Directory services are unavailable as a result you need to make use of the local Administrator password.

B.
You are unable to log in because another domain controller is unavailable to authenticate the login.

C.
You are unable to log in because the permissions on the domain controller do not allow users to log on locally.

D.
You are unable to log in because another domain administrator disabled the account.

Explanation:
When you boot in Directory Services Restore mode the Active Directory is not started and network services are all disabled. The systems administrator will therefore have to make use of a local account in order to log in.