Which cmdlet should you use?

You have a hosted Exchange organization. All servers in the organization have Exchange
Server 2010 Service Pack 1 (SP1) installed.
You have 3 mailbox servers in a DAG. You want to enable Datacenter Activation Coordination on exiting the DAG.
Which cmdlet should you use?

A.
Set-DatabaseAvailabilityGroup.

B.
Get-DatabaseAvailabilityGroup.

C.
New-DatabaseAvailabilityGroup.

D.
Add-MailboxDatabaseCopy.

Explanation:
The command looks like this:
Set-DatabaseAvailabilityGroup -Identity DAG1 -DatacenterActivationMode DagOnly

http://technet.microsoft.com/en-us/library/dd297934.aspx