What is the main difference between ISO $45001(2018)$ and OSHAS $18001?$

a$.$

ISO $45001$ concentrates on the contact within an organisation$$s business environment, while OHSAS $18001$ focuses mainly on managing the organisation$$s OHS hazards and other internal problems.

b$.$

ISO $45001$ concentrates on collaboration within an organisation$$s business environment, while OHSAS $18001$ focuses mostly on managing the organisation$$s OHS hazards and other internal aspects.

c$.$

ISO $45001$ concentrates on communication within an organisation$$s business environment, while OHSAS $18001$ focuses generally on managing the organisation$$s OHS hazards and other internal challenges.

d$.$

ISO $45001$ concentrates on the interaction within an organisation$$s business environment, while OHSAS $18001$ focuses primarily on managing the organisation$$s OHS hazards and other internal issues.