You are the administrator of an Active Directory domain. All servers run Windows Server 2003. All client computers run Windows XP Professional.A server named Filesrv1 contains confidential data that is only available to users in the human resources （HR） department.You want all computers in the HR department to connect to Filesrv1 by using an IPSec policy. You assign the Server （Request Security） IPSec policy to Filesrv1. Using Network Monitor， you notice that some computers in the HR department connect to Filesrv1 without using the IPSec policy.You need to configure Filesrv1 to ensure that all computers connect to it by using the IPSec policy.   What should you do？（）

• A、Assign the Secure Server （Require Security） IPSec policy.
• B、Assign the Client （Respond Only） IPSec policy.
• C、Unassign the Server （Request Security） IPSec policy.
• D、Restart the IPSec Services service.