Your network contains an Active Directory domain named adatum.com. The domain
contains three domain controllers.
The domain controllers are configured as shown in the following table.

DC3 loses network connectivity due to a hardware failure.
You plan to remove DC3 from the domain.
You log on to DC3.
You need to identify which service location (SRV) records are registered by DC3.
What should you do?

A.
Open the %windir%\system3Adns\backup\adatum.com.dns file.

B.
Run dcdiag/test:dns.

C.
Run ipconfig /displaydns.

D.
Open the %windir%\system32\config\netlogon.dns file.

Explanation:
http://technet.microsoft.com/en-us/library/cc959303.aspx
http://technet.microsoft.com/en-us/library/cc731968(v=ws.10).aspx