You have an Exchange organization. All servers in the organization have Exchange Server 2010 SP1 installed.

The organization contains a database availability group (DAG) named DAG1. DAG1 contains two Mailbox server named Server1 and Server2. Five databases are replicated in DAG1.

You need to install Exchange rollup updates on Server1. The solution must not prevent users from accessing their mailboxes.

What should you do first?

A.
run the Set-DatabaseAvailabilityGroup cmdlet, and then enable Datacenter Activation Coordination for DAG1.

B.
run the Set-MailboxDatabase cmdlet, and then configure all mailbox database copies as lagged copies.

C.
Run the Suspend-MailboxDatabaseCopy cmdlet, and then switch over all mailbox databases to Server2.

D.
run the Update-MailboxDatabaseCopy cmdlet, and then modify the mailbox database Activiation preference.