You have a server that has Microsoft Exchange Server 2007 with Service Pack 1 (SP1) and Microsoft Windows Server 2008 installed. The mailbox database fails. You need to ensure that users are able to send and receive e-mail during the recovery of the mailbox database. What should you do?

A.
Create a recovery storage group.

B.
Use the Exchange Mail Flow Troubleshooter.

C.
Run the New-MailboxDatabase cmdlet.

D.
Perform a dial tone recovery.