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.
Run the regsvr32.exe command.

C.
Modify the PATH system variable.

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

Explanation:
The error message is related to missing role configuration.