"Knowledge" as an Element of the Tort of Negligent Hiring,means

Multiple Choice

"Knowledge" as an element of the tort of negligent hiring,means that:

A) the employer knew the employee was unfit
B) the employer should have known the employee was unfit
C) the employer would have known the employee was unfit if it had done an appropriate background check
D) any of these might constitute such "knowledge"
E) none of these constitutes such "knowledge"