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 automatically issue 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.