Jane, the administrator of a small company, wishes to track people who access the secured server room, which is secured only by a simple hardware key lock. Jane does not have much of a budget or the approval to make significant construction changes. Given the limitations, which of the following can she do in the meantime?

A.
Implement an access log and a security guard

B.
Install a 24/7 closed-circuit camera system

C.
Install a separate hardware lock with limited keys

D.
Implement a cipher key lock