You need to bring DC2 back online as the PDC emulator as soon as possible

Your network contains an Active Directory forest named contoso.com. The domain contains
two domain controllers named DC1 and DC2 that run Windows Server 2008 R2. DC2 holds
the PDC emulator role.
The power supply on DC2 fails.
You seize the PDC emulator role to DC1.
You replace the power supply on DC2.
You need to bring DC2 back online as the PDC emulator as soon as possible. The solution
must minimize the disruption of services for users.
What should you do?

A.
Connect DC2 to the network. Turn on DC2, and then transfer the PDC emulator role.

B.
Reinstall Windows Server 2008 on DC2 and promote DC2 to a domain controller.
Transfer the PDC emulator role.

C.
Reinstall Windows Server 2008 on DC2 and promote DC2 to a domain controller. Seize
the PDC emulator role.

D.
Disconnect DC2 from the network. Turn on DC2, and then seize the PDC emulator role.
Connect DC2 to the network.