You deploy two Windows Server 2008 R2 Hyper-V servers. You manage the servers by using Microsoft System Center Virtual Machine Manager （VMM） 2008 R2. You need to ensure that you can restore virtual machines （VMs） in the event of a hardware failure. What should you do？（）
A. Use a PowerShell script to create a snapshot of each VRun the script every 60 minutes on each Hyper-V server
B. Use a PowerShell script to create a checkpoint of each VRun the script every 60 minutes on each Hyper-V server
C. Use a PowerShell script to pause， export， and start each VM， and then to copy the export to the opposite Hyper-V server. Run the script once per day on each Hyper-V server
D. Use a PowerShell script to shut down， export， and start each VM， and then to copy the export to the opposite Hyper-V server. Run the script once per day on each Hyper-V server
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