Your network contains Microsoft System Center Virtual Machine Manager and 10 Hyper-V hosts. You plan to convert all of the domain controllers to virtual machines （VMs）. You need to recommend a recovery solution for the domain controllers. The solution must meet the following requirements： - Prevent inconsistencies in the Active Directory database. - Provide for the recovery of accidentally deleted Active Directory objects. - Provide for recovery if an administrator incorrectly modifies system settings. What should you include in the recommendation？（）

• A、VM snapshots
• B、a VM checkpoint
• C、Windows Server Backup from within the VMs
• D、Windows Server Backup from the Hyper-V hosts