Your company has an Active Directory Domain Services （AD DS） domain that includes an AD security group named Monitoring. You are configuring a Windows Server 2008 R2 Hyper-V server that hosts several virtual machines （VMs）. You need to ensure that members of the Monitoring group can only stop and start VMs on the host server. What should you do？（）

• A、Add the Monitoring group to the Server Operators AD security group.
• B、In Authorization Manager， add the Monitoring group to the Administrator role in the default scope.
• C、In Authorization Manager， create a task that includes the Stop Virtual Machine and Start Virtual Machine operations. Add the task to the Administrator role.
• D、In Authorization Manager， create a role in the default scope. Add the Stop Virtual Machine and Start Virtual Machine operations to the role. Assign the Monitoring group to the role.