You have a single Active Directory directory service domain. Your company has a main office and multiple branch offices. Each office has an Active Directory site. The companys network is not fully routed. You need to ensure complete replication between the Active Directory sites. What should you do?

A.
Configure site links, and disable site link bridging.

B.
Configure site links to use the SMTP transport, and enable site link bridging.

C.
Configure a preferred bridgehead server for each branch office site.

D.
Configure a preferred bridgehead server for the main office site.