HOTSPOT
You have an Exchange Server 2013 organization that contains three servers. The servers are
configured as shown in the following table.
All of the servers are part of a database availability group (DAG) named DAG1.
The databases are configured as shown in the following table.
All of the databases replicate between all the members of DAG1.
You plan to move all mailboxes from DB1 to DB2.
You need to ensure that the passive copies of DB1 are in a healthy state before you move the
mailboxes.
Which command should you run? (To answer, select the appropriate options in the dialog box in the
answer area.)
Answer: 
this is right…
https://technet.microsoft.com/en-us/library/bb123971(v=exchg.160).aspx
None Moves shouldn’t be throttled to ensure high availability. Use this setting if the database isn’t part of a database availability group (DAG).
• SecondCopy At least one passive mailbox database copy must have the most recent changes synchronized. This is the default value. Use this setting to indicate that the database is replicated to one or more mailbox database copies.
• SecondDatacenter At least one passive mailbox database copy in another Active Directory site must have the most recent changes replicated. Use this setting to indicate that the database is replicated to database copies in multiple Active Directory sites.
• AllDatacenters At least one passive mailbox database copy in each Active Directory site must have the most recent changes replicated. Use this setting to indicate that the database is replicated to database copies in multiple Active Directory sites.
• AllCopies All copies of the database must have the most recent changes replicated. Use this setting to indicate that the database is replicated to one or more mailbox database copies.
If there were multiple servers at each site then you would use allcopies as each site will have multiple copies.
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