You are decommissioning one of the domain controllers in a child domain.
You need to transfer all domain operations master roles within the child domain to a newly
installed domain controller in the same child domain.
Which three domain operations master roles should you transfer? (Each correct answer
presents part of the solution. Choose three.)

A.
RID master

B.
PDC emulator

C.
Schema master

D.
Infrastructure master

E.
Domain naming master

Explanation:
http://technet.microsoft.com/en-us/library/cc781578%28v=ws.10%29.aspx
Transferring operations master roles
Transferring an operations master role means moving it from one domain controller to
another with the cooperation of the original role holder. Depending upon the operations
master role to be transferred, you perform the role transfer using one of the three Active
Directory consoles in Microsoft Management Console (MMC).