You are the administrator of an Active Directory domain named All servers run Windows Server 2003. All client computers run Windows 2000 Professional with Service Pack 2. You install Software Update Services (SUS) on a computer named Testking1, and you approve all downloaded updates. You apply the appropriate Group Policy object (GPO) settings to configure domain computers to download critical updates from Testking1. You discover that no updates were applied since you installed SUS on Testking1. You confirm that all the Windows Server 2003 computers receive updates from Testking1. You need to ensure that all client computers receive updates from Testking1. What are two possible ways to achieve this goal?（） (Each correct answer presents a complete solution. Choose two)

A. Install Service Pack 3 on all client computers.
B. Move all client computers out of the Computers contain and into a new organizational unit (OU).
C. Enable the No Override GPO setting.
D. Install the Automatic Updates client on all client computers.
E. Configure Testking1 to authenticate against a proxy server to receive updates from the Windows Update servers.