You manage your virtual environment by using Microsoft System Center Virtual Machine Manager （VMM） 2008 R2. You monitor the environment by using Microsoft System Center Operations Manager 2007 R2. You have three Windows Server 2008 R2 Hyper-V servers in a failover cluster. You need to ensure that all virtual machines （VMs） are distributed automatically across the host servers， and that the VMs will automatically fail over to the most appropriate host server. What should you do？（）

A. Configure network load balancing on the VMs.
B. Configure Performance and Resource Optimization （PRO） Tips for the VMs.
C. In VMM， create a host group. Move the three host servers into the host group.
D. Configure a Fiber Channel logical unit number （LUN） on a SAN device. Configure your VMs to store the configuration files on the Fiber Channel LUN