Your network contains a server named Server1 that runs Windows Server 2012 R2.
Server1 has the Hyper-V server role installed. Server1 hosts 10 virtual machines that run Windows Server 2012 R2.
You add a new server named Server2. Server2 has faster hard disk drives, more RAM, and a different processor manufacturer than Server1.
You need to move all of the virtual machines from Server1 to Server2.
The solution must minimize downtime. W
hat should you do for each virtual machine?

A.
Perform a quick migration.

B.
Perform a storage migration.

C.
Export the virtual machines from Server1 and import the virtual machines to Server2.

D.
Perform a live migration.

Explanation:
C)
Other options require same CPU family and cluster
http://technet.microsoft.com/en-us/library/hh848491.aspx
http://technet.microsoft.com/en-us/library/hh848495.aspx
http://technet.microsoft.com/en-us/library/jj628158.aspx

The different processor manufacturer is the key here. Storage, Live, and Quick all require same manufacturer.