DRAG DROP
You have an Exchange Server 2016 organization. The organization contains two Mailbox servers.
You have a database that is replicated to both servers. The database contains 500 mailboxes.
You add new volumes to the Mailbox servers.
You need to move all of the mailbox data to the new volumes. The solution must meet the following
requirements:
Ensure that multiple copies of the mailbox data are available at all times.
Minimize downtime for the mailbox users.
Which three actions should you perform in sequence? To answer, move the appropriate actions from the list of
actions to the answer area and arrange them in the correct order.
Select and Place:
Answer: 
Explanation:
https://technet.microsoft.com/en-us/library/dd979782(v=exchg.150).aspx
I actually now agree with the answer, as per the link provided.
This is similar to another question but with slightly different answers.
Create new DB
move the database
create copies
Create DB, mount DB, create replicated DB copies
I agree w Mat
“Ensure that multiple copies of the mailbox data are available at all times.”
If you remove all the replicated copies there will be a time frame where copies are not available. Agree with Mat