HOTSPOT
Your network contains two Active Directory sites named MainSite and DRSite.
You have an Exchange Server 2013 organization that contains two servers. The servers are
configured as shown in the following table.
The active copy of DB1 is located on EX1. There are typically 100 MB of log files queued on EX1.
You need to recommend a procedure to allow administrators to mount the mailbox database copies
on EX2 if EX1 fails. The recovery point objective (RPO) for mailbox data is 200 MB.
Which command should you recommend running? (To answer, select the appropriate options in the
answer area.)
Answer: 
MountDialOverride:BestEffort If you specify this value, the database automatically mounts regardless of the size of the copy queue length.
Move-ActiveMailboxDatabase – to perform a database or server switchover.
MountDialOverride parameter is used to override the auto database mount dial setting for the target server and specify an alternate setting.
agree with you