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