Your virtual environment includes a Windows Server 2008 R2 Hyper-V failover cluster. You manage the environment by using Microsoft System Center Virtual Machine Manager （VMM） 2008 R2. You need to configure the live migration network priorities for all virtual machines （VMs）. What should you do？（）

• A、Enable Cluster Shared Volumes （CSVs）.
• B、In Failover Cluster Manager， edit the properties of a single VM.
• C、In Virtual Network Manager， edit the properties of the virtual network.
• D、In Hyper-V Manager， take each VM offline and edit the settings of each VM.