Mary is a new security administrator. She wants to focus most of her efforts on the areas that have the greatest risk. Which of the following areas poses the greatest risk?

A.
Employees

B.
Hackers

C.
Cyber terrorism

D.
Viruses

Explanation:
Employees pose the greatest risk. Even malware is often introduced to a network through lack of diligence on the part of employees.

Answer option B is incorrect. While hackers are a real problem, they pose less risk than internal employees.

Answer option D is incorrect. Viruses are a legitimate concern. However, they are often introduced due to employees failing to follow security polices.

Answer option C is incorrect. It is the case that cyber terrorism is a real threat. However, it is less of a threat than employees.