Which Type of Workplace Violence Accounts for the Majority of Workplace

Which type of workplace violence accounts for the majority of workplace homicides?

A) Violent acts by criminals otherwise unconnected to the workplace
B) Violence directed at employees by customers or clients
C) Violence against coworkers, supervisors, or managers by a present or former employee
D) Violence committed by someone who is not connected to the workplace but who has a personal relationship with an employee