Final answer:
D) Incident Commander (IC). The Incident Commander (IC) is ultimately responsible for the safety of all responders. The ISO is trusted to help meet that responsibility.
Step-by-step explanation:
The Incident Commander (IC) is ultimately responsible for the safety of all responders in emergency situations. The IC is the person in charge of managing the overall response to an incident or emergency, and their main duty is ensuring the safety and well-being of all individuals involved. The ISO (Safety Officer) is a trusted member of the response team who works closely with the IC to meet their responsibility for responder safety.