Your company has an Active Directory domain. All servers run Windows Server 2008 R2. Your   company uses an Enterprise Root certificate authority （CA）.    You need to ensure that revoked certificate information is highly available.    What should you do（）

• A、Implement an Online Certificate Status Protocol （OCSP） responder by using Network Load Balancing.
• B、Implement an Online Certificate Status Protocol （OCSP） responder by using an Internet Security and  Acceleration Server array.
• C、Publish the trusted certificate authorities list to the domain by using a Group Policy Object （GPO）.
• D、Create a new Group Policy Object （GPO） that allows users to trust peer certificates. Link the GPO to  the domain.