A.Microsoft System Center Operations Manager with Performance and Resource Optimization （PRO）
B.virtual machine queue （VMQ）
C.Network Load Balancing （NLB） for the VMs
D.quick migration
E.Microsoft System Center Virtual Machine Manager 2008 R2
F.Network Load Balancing （NLB） for the Hyper-V hosts
G.Cluster Shared Volumes （CSV）
H.Windows System Resource Manager （WSRM）
I.Virtual Machine Chimney
J.pass-through disks
K.a failover cluster for the Hyper-V hosts
L.Second-Level Address Translation （SLAT）
M.a failover cluster between the VMs
N.Network Attached Storage （NAS）
O.a Fibre Channel Storage Area Network （SAN）
P.an iSCSI Storage Area Network （SAN）

A.Import the checkpoint into the test environment， and apply the application update for testing
B.Create a checkpoint of the three VMs， and export the checkpoint to the test environment
C.Create three VMs in the test environment， attach the existing .vhd files， and apply the application update for testing
D.Pause the three VMs， and copy the .vhd files to the test environment