Final answer:
The audit log keeps a record of every file opened and every keystroke made.
Step-by-step explanation:
The correct option that keeps a record of every file opened and every keystroke made is the Audit log. An audit log is a record maintained by computers or software systems that keeps track of all events, activities, and changes made within the system. It is often used for security and accountability purposes, as it provides a detailed trail of actions taken.