Which of the following is the reason of logging by Mark when a user is successfully logged into the system as well as when he is failed?

Mark works as a Systems Administrator for TechMart Incl. The company has Windows-based network.
Mark has been assigned a project to track who triesto log into the system and the time of the day at which the attempts occur. He is also required to create a system to track when confidential files are opened andwho is trying to open it. Now, Mark logs when someone is not able to make a successful attempt to log into the system as Administrator but he also wants to log when the user is successful to log into the system as Administrator.
Which of the following is the reason of logging by Mark when a user is successfully logged into the system as well as when he is failed?

A.
To determine if and when someone is authenticating successfully with high privilege.

B.
To make sure that user is not using the Administrator account.

C.
To determine if and when someone is authenticating successfully with high privilege.

D.
To make sure that user is not facing any problem.