You have an Active Directory domain that runs Windows Server 2008 R2.
You need to implement a certification authority (CA) server that meets the following requirements:
Allows the certification authority to automaticallyissue certificates
Integrates with Active Directory Domain Services
What should you do?

A.
Install and configure the Active Directory Certificate Services server role as a Standalone Root CA.

B.
Install and configure the Active Directory Certificate Services server role as an Enterprise Root CA.

C.
Purchase a certificate from a third-party certification authority, Install and configure the Active Directory
Certificate Services server role as a Standalone Subordinate CA.

D.
Purchase a certificate from a third-party certification authority, Import the certificate into the computer store
of the schema master.