You need to ensure that when Admin1 opens the Certification Authority console on Server1, the error message does not appear

You have a server named Server1 that runs Windows Server 2012 R2. From Server Manager, you
install the Active Directory Certificate Services server role on Server1.
A domain administrator named Admin1 logs on to Server1. When Admin1 runs the Certification
Authority console, Admin1 receive the following error message.

You need to ensure that when Admin1 opens the Certification Authority console on Server1, the
error message does not appear.
What should you do?

A.
Install the Active Directory Certificate Services (AD CS) tools

B.
Configure the Active Directory Certificate Services server role from Server Manager

C.
Run the regsvr32.exe command

D.
Modify the PATH system variable