HOTSPOT
You have an Exchange Server 2013 organization that contains three servers named EX1, EX2, and
EX3 in a single Active Directory site. All of the servers are members of a database availability group
(DAG) named DAG1. Each server has a copy of all the mailbox databases.
You discover that the copies of a database named DB1 are in a FailedAndSuspended state due to
disk failures on EX2 and EX3.
You replace the disks.
You need to start seeding DB1 on EX2 from EX1. The solution must ensure that DB1 can be seeded
on EX3 simultaneously.
What command should you run? To answer, select the appropriate options in the answer area.
Answer: 
Explanation:
Update-MailboxDatabaseCopy
https://technet.microsoft.com/en-us/library/dd335201(v=exchg.150).aspx