Your network consists of a single Active Directory domain. All servers run Windows Server 2008 R2.   You need to recommend a Group Policy deployment strategy. Your strategy must support the following  requirements： èDomain-level Group Policy objects （GPOs） must not be overwritten by organizational unit （OU） level  GPOs.   èOU-level GPOs must not apply to members of the Server Operators group. What should you recommend？（）

• A、Enable Block Inheritance for the domain，and then modify the permissions of all GPOs linked to OUs.
• B、Enable Block Inheritance for the domain， and then enable Loopback Processing policy mode. Add the Server Operators group to the Restricted Groups list.
• C、Set all domain level GPOs to Enforced， and then modify the permissions of the GPOs that are linked to  OUs.
• D、Set all domain level GPOs to Enforced，and then enable Loopback Processing policy mode.Add the server Operators group to the Restricted Groups list.