Your network contains two Exchange Server 2010 Mailbox servers.

You create a database availability group (DAG). You need to ensure that the Exchange servers can replicate mailbox databases.

What should you do?

A.
Modify the membership list of the DAG.

B.
Add the Network Load Balancing feature on both servers.

C.
Add Active Directory Federation Services (AD FS) on both servers.

D.
Enable Datacenter Activation co-ordination (DAC) mode for the DAG.