You need to recommend a backup strategy for Hyper-V. What should you recommend？（）

• A、Take a snapshot of each VM， and then run a full backup of the Hyper-V hosts by using Windows Server  Backup.
• B、Shut down the VMs，and then run a full backup of the Hyper-V hosts by using Windows Server Backup. Restart the VMs when the backup is complete.
• C、From each VM,run a full backup by using Windows Server Backup， and then run a full backup of the Hyper-V hosts by using Windows Server Backup.
• D、From each VM,run a full backup by using Windows Server Backup. Shut down the VMs， and then run a full backup of the Hyper-V hosts by using Windows Server Backup. Restart the VMs when the backup is complete.