Your company has a single-domain Active Directory forest. The functional level of the domain is Windows Server 2008.   You perform the following activities.    Create a global distribution group.      Add users to the global distribution group.      Create a shared folder on a Windows Server 2008 member server.      Place the global distribution group in a domain local group that has access to the shared folder.  You need to ensure that the users have access to the shared folder.  What should you do（）

• A、Raise the forest functional level to Windows Server 2008.
• B、Add the global distribution group to the Domain Administrators group.
• C、Change the group type of the global distribution group to a security group.
• D、Change the scope of the global distribution group to a Universal distribution group.