单项选择题 You have a Windows Server 2008 R2 Hyper-V server. One of the virtual machines （VMs） that is hosted on the server has a directly attached physical disk. You need to back up the VM. What should you do？（）

单项选择题 You have a Windows Server 2008 R2 Hyper-V server. You take periodic snapshots of your virtual  machines （VMs） when the VMs are not running. You delete several snapshots from the snapshot tree of a VM. The .avhd files that are associated with the deleted snapshots are not deleted from the volume where the VHD files are stored. You need to ensure that the .avhd files are deleted. What should you do？（）

单项选择题 You have a Windows Server 2008 R2 Hyper-V server. You need to ensure that you are prompted to specify a custom snapshot name when you create a snapshot. What should you use to create the snapshot？（）