You are the network administrator for Testking.com. The network consists of a single Active Directory domain testking.com. The functional level of the domain is Windows 2000 native. Some network servers run Windows 2000 Server, and others run Windows Server 20003. All users in your accounting department are members of an existing global distribution group named Global-1. You create a new network share for the accounting users. You need to enable the members of Global-1 to access the file share. What should you do?（）
- A Raise the functional level of the domain to Windows Server 2003.
- B Change the group type of Global-1 to security.
- C Change the group scope of Global-1 to universal.
- D Raise the functional level of the forest to Windows Server 2003.