问题：

[单选]

You are the network administrator for The network consists of a single Active Directory domain named The domain contains 15 Windows Server 2003 computers and 3,000 Windows XP Professional computers. All client computers are running the most recent service pack.
You install and configure Software Update Services (SUS) on a server named Testking1. You install the Automatic Updates client on all client computers. All client computer accounts are in the Clients organization unit (OU).
Currently all client computers obtain their Windows security updates from Windows Update. You want all client computers, and no other computers, to obtain their updates from Testking1.
You need to configure all client computers to obtain Windows security updates from Testking1. You need to accomplish this task with the minimum amount of administrative effort.
What should you do?（）

A . Create a Group Policy object (GPO) named SUS and link it to the Clients OU. Open the SUS GPO and enable the Configure Automatic Update policy to automatically download updates.
B . Create a Group Policy object (GPO) named SUS and link it to the Clients OU. Open the SUS GPO and enable the Specify intranet Microsoft updates service location policy to use http://Testking1 as the value for the update and statistics server.
C . Create a Group Policy object (GPO) named SUS and link to the domain. Open the SUS GPO and enable the Specify intranet Microsoft update service location policy to use http://Testking1 as the value for the update and statistics server.
D . Create a Group Policy object (GPO) named SUS and link it to the domain. Open the SUS GPO and enable the Configure Automatic Update policy to automatically download updates.