What Are the Two Essential Limitations on the Right to Refuse

What are the two essential limitations on the right to refuse unsafe work outlined in OH&S Acts across Canada?

A) There are no limits on the right to refuse unsafe work in Canadian jurisdictions.
B) The worker has previously performed the task, or the refusal would place another person's safety in jeopardy.
C) The employee works in a declared profession such as policing, or the refusal would place another person's safety in jeopardy.
D) The task in question is a normal condition of employment, or the refusal would place another person's safety in jeopardy.