HOTSPOT
You have an Exchange Server 2013 organization that contains the servers configured as shown in the
following table.
All of the Exchange servers run Windows Server 2012 R2 and are members of a database availability
group (DAG) named DAG1.A mailbox database named DB1 replicates between EX1, EX2, EX3, and EX7. The mailbox database
copy of DB1 on EX7 is a lagged database.
You need to ensure that if the number of healthy database copies of DB1 is less than three during a
24-hour period, the logs in the lagged database replay automatically.
What command should you run? To answer, select the appropriate options in the answer area.
Answer: 
Explanation:
Lagged Mailbox Database Copy-Exchange 2013 Enhancements
http://exchangeonline.in/lagged-mailbox-database-copy-exchange-2013-enhancements/