You are the network administrator for your company. The network consists of a single Active Directory domain. All computers on the network are members of the domain. All servers run Windows Server 2003 and all client computers run Windows XP Professional. You are planning a security update infrastructure. You need to find out which computers are exposed to known vulnerabilities. You need to collect the information on existing vulnerabilities for each computer every night. You want this process to occur automatically. What should you do？ （）

A. Schedule the secedit command to run every night.
B. Schedule the mbsacli.exe command to run every night.
C. Install Microsoft Baseline Security Analyzer （MBSA） on one of the servers. Configure Automatic Updates on all other computers to use that server.
D. Install Software Update Services （SUS） on one of the servers. Configure the SUS server to update every night.