Your company has a single Active Directory directory service domain. Servers in your environment run Windows Server 2003. Client computers run Windows XP or Windows Vista. You plan to create an internal centrally managed security update infrastructure for client computers. You need to choose a security update management tool that supports all the client computers.  Which tool should you choose？ （）

• A、 Microsoft Assessment and Planning （MAP） Toolkit
• B、 Microsoft Baseline Security Analyzer
• C、 Microsoft System Center Operations Manager
• D、 Windows Server Update Services （WSUS）