Which Statement Describes Due Diligence in the Context of Health

Which statement describes due diligence in the context of health and safety in the workplace?

A) it does not require an employer to implement a plan to identify possible workplace hazards
B) it is the level of care an employer would be expected to demonstrate to prevent workplace injuries
C) it is the level of caution an employee would reasonably be expected to exercise
D) it implies that employees must take a major responsibility for workplace safety