Your company has an Active Directory forest that contains client computers that run Windows Vista  and Windows XP.   You need to ensure that users are able to install approved application updates on their computers.  Which two actions should you perform（）

• A、Set up Automatic Updates through Control Panel on the client computers.
• B、Create a GPO and link it to the Domain Controllers organizational unit. Configure the GPO to  automatically search for updates on the Microsoft Update site.
• C、Create a GPO and link it to the domain. Configure the GPO to direct the client computers to the  Windows Server Update Services （WSUS） server for approved updates.
• D、Install the Windows Server Update Services （WSUS）. Configure the server to search for new updates  on the Internet. Approve all required updates.