You are the network administrator for your company. The network consists of a single Active Directory domain. All servers run Windows Server 2003. All client computers run either Windows 2000 Professional with Service Pack 4 or Windows XP Professional. You install Windows Server Update Services （WSUS） on a computer named Server2. You create a Group Policy object （GPO） that configures all client computers to receive software updates from Server2. One week later， you run Microsoft Baseline Security Analyzer （MBSA） on all client computers to find out whether all updates are being applied. You discover that all of the Windows 2000 Professional client computers receive updates， but the Windows XP Professional client computers do not receive updates.  You verify that the GPO setting was applied on all Windows XP Professional computers. You need to ensure that the Windows XP Professional client computers receive their updates from Server2.   What should you do？（）

• A、Make all users of Windows XP Professional client computers members of the Administrators local group.
• B、On all Windows XP Professional client computers， install the latest service pack.
• C、On all Windows XP Professional client computers， use the gpupdate /force command.
• D、On all Windows XP Professional client computers， delete the NoAutoUpdate value under HKEY_LOCAL_MACHINE/SOFTWARE/Policies/Microsoft/Windows/WindowsUpdate/AU.