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
Firstly, the parameters on the right are only parameters of update-mailboxdatabasecopy, so the first option has to be this.
We don’t want to do either the catalog or database only so these 2 are out.
The MaximumSeedsInParallel parameter is used with the Server parameter to specify the maximum number of parallel seeding operations that should occur across the specified server during a full server reseed operation. The default value is 10.
So we don’t need to do anything with this as we are only wanting to do 2 seeds in parallel.
Therefore the answer above is correct.