Your network contains an Active Directory forest.
The forest contains one domainnamed contoso.com.
You attemptto run adprep /domainprepand the operation fails.
You discover that the first domain controller deployed to the forest failed.
You need to run adprep /domainprep successfully.
What should you do?

A.
Move the domain naming master role.

B.
Install a read-only domain controller (RODC).

C.
Move the PDC emulator role.

D.
Move the RID master role.

E.
Move the infrastructure master role.

F.
Deploy an additional global catalog server.

G.
Move the bridgehead server.

H.
Move the schema master role.

I.
Restart the Active Directory Domain Services (AD DS) service.

J.
Move the global catalog server.

Explanation:
Adprep /domainprep must be run on the server holding theInfrastructure Master role. The role was
originally installed on the first domain controllerin the forest. Now it’s down and another domain controller must
get the Infrastructure Master role.
Reference 1:
http://technet.microsoft.com/en-us/library/cc754889.aspx
Planning Operations Master Role Placement
Operations master role holders are assigned automatically when the first domain controller in a given domain is
created. The two forest-level roles (schema master and domain naming master) are assigned to the first
domain controller created in a forest. In addition,the three domain-level roles (RID master, infrastructure
master, and PDC emulator) are assigned to the first domain controller createdin a domain.
Reference 2:
http://technet.microsoft.com/en-us/library/dd464018.aspx
adprep /domainprep
Must be run on theinfrastructure operations masterfor the domain.