Which two actions should you perform?

Your network contains a single Active Directory domain.
A domain controller named DC2 fails.
You need to remove DC2 from Active Directory.
Which two actions should you perform? (Each correct answer presents part of the solution.
Choose two.)

A.
At the command prompt, run dcdiag.exe /fix.

B.
At the command prompt, run netdom.exe remove dc2.

C.
From Active Directory Sites and Services, delete DC2.

D.
From Active Directory Users and Computers, delete DC2.

Explanation:
http://technet.microsoft.com/en-us/library/cc816907.aspx
Clean Up Server Metadata
Metadata cleanup is a required procedure after a forced removal of Active Directory Domain
Services (AD DS).
You perform metadata cleanup on a domain controller in the domain of the domain controller
that you forcibly removed. Metadata cleanup removes data from AD DS that identifies a
domain controller to the replication system.
Clean up server metadata by using GUI tools

Clean up server metadata by using Active Directory Users and Computers
1. Open Active Directory Users and Computers: On the Start menu, point to Administrative
Tools, and then click Active Directory Users and Computers.
2. Expand the domain of the domain controller that was forcibly removed, and then click
Domain Controllers.
3. In the details pane, right-click the computer object of the domain controller whose
metadata you want to clean up, and then click Delete.
Clean up server metadata by using Active Directory Sites and Services
1. Open Active Directory Sites and Services: On the Start menu, point to Administrative
Tools, and then click Active Directory Sites and Services
2. Expand the site of the domain controller that was forcibly removed, expand Servers,
expand the name of the domain controller, right-click the NTDS Settings object, and then
click Delete.