You have an Exchange Server 2010 organization that contains three Mailbox servers named
MBX1, MBX2, and MBX3.
You configure a journaling mailbox on a server named MBX3.
You configure journaling on several mailboxes located on MBX1 and MBX2.
You need to ensure that journaling occurs if MBX3 fails.
What should you do?

A.
Configure an alternate journaling mailbox on MBX2.

B.
Configure a second e-mail address for the journaling mailbox.

C.
Configure the shadow redundancy settings in the organization.

D.
Create a retention tag and then assign it to a new retention policy.