Which of the following groups represents the leading source of computer crime losses?

A.
Hackers

B.
Industrial saboteurs

C.
Foreign intelligence officers

D.
Employees

Explanation:
Most computer crimes are not committed by hackers but by trusted employees–programmers, managers,
clerks, and consultants–who turn against their employers, using company computers for extortion, theft, and
sabotage.
Incorrect Answers:
A: Hackers commit computer crimes, but employees are the main threat.
B: Industrial saboteur is a rare computer crime occurrence. Most often the crime is made by an employee.
C: Foreign intelligence officers do commit computer crimes, but it is rare. Most often the crime is made by an
employee.

https://en.wikipedia.org/wiki/Cybercrime