You plan to deploy two virtual machines （VMs） that will run Microsoft Exchange Server 2010 and will have the Mailbox server role installed. The VMs will have access to only the local disks on the Hyper-V hosts. You need to recommend a solution to ensure that the Exchange Server Mailbox services are available if a single VM fails. What should you include in the recommendation？（）

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