Your company has a single Active Directory domain. All domain controllers run Windows Server 2003.
You install Windows Server 2008 R2 on a server.
You need to add the new server as a domain controller in your domain.
What should you do first?

A.
On the new server, run dcpromo /adv.

B.
On the new server, run dcpromo /createdcaccount.

C.
On a domain controller run adprep /rodcprep.

D.
On a domain controller, run adprep /forestprep.