You have a Lync Server 2013 infrastructure that contains seven servers. The servers are configured as shown in the following table.

You configure pool pairing and SQL Server database mirroring.
SQL1 fails.

You discover that an automatic failover fails to occur.
You need to force a failover of the database.
Which command should you run?

A.
invoke-csdatabasefailover -poolfqdn pool01.contoso.com -databasetype user -newprincipal primary

B.
Invoke-csdatabasefailover -poolfqdn pool02.contoso.com -databasetype user -newprincipal mirror

C.
Invoke-csdatabasefailover -poolfqdn pool02.contoso.com -databasetype user -newprincipal primary

D.
Invoke-csdatabasefailover -poolfqdn pool01.contoso.com -databasetype user -newprincipal mirror

Explanation:
http://technet.microsoft.com/en-us/library/jj204744.aspx