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.
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.