You have an Exchange Server 2010 organization that contains a database availability group
(DAG) named DAG1. DAG1 contains five Mailbox servers including a server named MBX1.
MBX1 fails. You plan to perform a recovery installation of MBX1.
You need to ensure that the restored server can become a member of DAG1.
The solution must ensure that mailbox databases are available if a single server fails.
What should you do?

A.
Remove MBX1 from DAG1.

B.
Remove all mailbox database copies from DAG1.

C.
Remove the computer account for MBX1 from Active Directory.

D.
Run the Clean-MailboxDatabase cmdlet on all other members of DAG1 except MBX1.