Your network consists of one Active Directory domain. All domain controllers run Windows Server 2008 R2.
You need to deploy Active Directory Certificate Services on the network to support the following requirements:
� Maintain availability if a single server fails.
� Delegate the enrollment of certificates for separate groups of users,
� Restrict the types of certificates that can be issued by a certificate manager.
What should you do?

A.
Deploy two servers that run Windows Server 2008 R2 Enterprise. Configure a failover cluster.Configure an enterprise certification authority (CA).

B.
Deploy two servers that run Windows Server 2008 R2 Enterprise. Configure a failover cluster.Configure a standalone root certification authority (CA).

C.
Deploy two servers that run Windows Server 2008 R2 Enterprise. Configure an enterprise root certification authority (CA) and a standalone subordinate CA.

D.
Deploy two servers that run Windows Server 2008 R2 Standard. Configure a standalone root certification authority (CA) and an enterprise subordinate CA.