Your company has a main office and 10 branch offices. Each branch office has an Active   Directory site that contains one domain controller. Only domain controllers in the main office are  configured as Global Catalog servers.     You need to deactivate the Universal Group Membership Caching option on the domain  controllers in the branch offices.   At which level should you deactivate the Universal Group Membership Caching option（）

• A、Site
• B、Server
• C、Domain
• D、Connection object