You need to design a Windows Server Update Services （WSUS） infrastructure that meets the  following requirements：   èThe updates must be distributed from a central location.   èAll computers must continue to receive updates in the event that a server fails. What should you include in your design？（）

• A、Configure two WSUS servers in a Microsoft SQL Server 2008 failover cluster. Configure each WSUS  server to use a local database.
• B、Configure a single WSUS server to use multiple downstream servers. Configure each WSUS server touse a RAID 1 mirror and a local database.
• C、Configure a single WSUS server to use multiple downstream servers. Configure each WSUS server to  use a RAID 5 array and a local database.
• D、Configure a Microsoft SQL Server 2008 failover cluster. Configure two WSUS servers in a Network Load Balancing cluster. Configure WSUS to use the remote SQL Server 2008 database instance.