You have an Exchange Server 2016 organization. The organization contains five Mailbox servers. The servers
are members of a database availability group (DAG). All of the databases in the DAG are replicated to all of the
members.You plan to perform scheduled maintenance on a Mailbox server named MBX3 that will place the server offline
for up to an hour.
You need to ensure that any active databases on MBX3 are activated on other DAG members before
performing the maintenance.
Which cmdlet should you use?

A.
Set-MailboxDatabaseCopy

B.
Stop-DatabaseAvailabilityGroup

C.
Resume-MailboxDatabaseCopy

D.
Set-MailboxServer

Explanation:
Use the DatabaseCopyActivationDisabledAndMoveNow parameter.

https://technet.microsoft.com/en-us/library/aa998651(v=exchg.160).aspx?f=255&MSPPError=-2147217396