What is the purpose of the OHSAS 18001 Occupational Health and Safety Assessment Series?

I- To provide the elements of a system that can be integrated with other systems.
II- To establish a policy and objectives according to national legal requirements.
III- To emphasize proactive preventive practices for identifying hazards or risk factors.
IV- To evaluate and control hazards or risk factors immediately.
a) Only I and II are correct.
b) Only III and IV are correct.
c) I, II, III, and IV are correct.