Your network contains an Active Directory forest named contoso.com. The forest contains
one domain. The domain contains three domain controllers. The domain controllers are
configured as shown in the following table.
DC2 fails and cannot be recovered.
Several weeks later, administrators report that they can no longer create new users and
groups in the domain.
You need to ensure that the administrators can create new users and groups.
What should you add?
A.
the RID master role to DC3
B.the schema master role to DC1
C.the infrastructure master role to DC1
D.the domain naming master role to DC3