Your network contains an Active Directory domain. All domain controllers run Windows Server 2008 R2 Service Pack 1 （SP1）. You need to recommend a design for the Hyper-V host infrastructure that meets the following requirements： - Maximizes storage performance. - Remains available if a host server fails. - Minimizes hardware and software costs. - Supports redundant access to shared storage. What should you include in the recommendation？（）

A. Failover Clustering
B. Remote Desktop Services （RDS）
C. Microsoft System Center Virtual Machine Manager 2008 R2
D. a Storage Area Network （SAN）
E. Network Attached Storage （NAS）
F. Network Load Balancing （NLB）
G. Multipath I/O