Certkiller.com runs Window Server 2008 on all of its servers. It has a single Active Directory domain and it uses Enterprise Certificate Authority. The security policy at Certkiller .com makes it necessary to examine revoked certificate information.  You need to make sure that the revoked certificate information is available at all times. What should you do to achieve that（）

• A、Add and configure a new GPO （Group Policy Object） that enables users to accept peer certificates and link the GPO to the domain.
• B、Configure and use a GPO to publish a list of trusted certificate authorities to the domain
• C、Configure and publish an OCSP （Online certificate status protocol） responder through ISAS （Internet Security and Acceleration Server） array.
• D、Use network load balancing and publish an OCSP responder.
• E、None of the above