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？（）

A.Hyper-V Manager
B.Windows Server Backup
C.the Virtual Machine Connection window
D.the Backup command-line tool （also known as wbadmin.exe）

A.In the Computer name field of the Add VMware VirtualCenter server dialog box， type the fully qualified domain name （FQDN） of Host1.
B.In the Computer name field of the Add VMware VirtualCenter server dialog box， type the fully qualified domain name （FQDN） of the VMware VirtualCenter server that manages Host1.
C.In the Add Hosts wizard， select the VMware ESX Server host （any location） option. In the Computer name field， type the fully qualified domain name （FQDN） of Host1.
D.In the Add Hosts wizard， select the VMware ESX Server host （any location） option. In the Computer name field， type the fully qualified domain name （FQDN） of the VMware VirtualCenter server that manages Host1.

A.In the Computer name field of the Add VMware VirtualCenter server dialog box， type the fully qualified domain name （FQDN） of Host1.
B.In the Computer name field of the Add VMware VirtualCenter server dialog box， type the fully qualified domain name （FQDN） of the VMware VirtualCenter server that manages Host1.
C.In the Add Hosts wizard， select the VMware ESX Server host （any location） option. In the Computer name field， type the fully qualified domain name （FQDN） of Host1.
D.In the Add Hosts wizard， select the VMware ESX Server host （any location） option. In the Computer name field， type the fully qualified domain name （FQDN） of the VMware VirtualCenter server that manages Host1.