A company has implemented Microsoft Exchange Server 2010 in an SRDF environment with replicas being taken at the disaster recovery (DR) site. During testing of this solution, they have failed over Exchange operations to the DR site. The Exchange mailbox server appears to come online, but user mailboxes are inaccessible. The Exchange Management Console shows all mailboxes marked with a small red “x” over the mailbox icons.
Which course of action will resolve this issue?

A.
Ensure the Exchange mailbox server at the DR site can communicate with an Active Directory Domain Controller

B.
Recover the database from the clone copies available at the DR site

C.
Ensure that the World Wide Web service on the Exchange server at the DR site has started successfully

D.
Recover the database from the remote clone copies available at the primary site