Final answer:
The Incident Commander is the person ultimately in charge of an incident, responsible for overall management and safety, while other roles like the Safety Officer and Operations Section Chief support operational aspects.
Step-by-step explanation:
The person ultimately in charge of an incident is known as the Incident Commander. This individual has the overall responsibility for managing the incident, overseeing all aspects of the incident response, including developing strategies, assigning resources, and ensuring the safety of all personnel involved. In contrast, the Safety Officer monitors the incident operations and advises the Incident Commander on matters relating to operational safety, ensuring all aspects of worker health and safety are taken into consideration. The Operations Section Chief is responsible for the direct management of all incident-related operational activities. Finally, the Liaison Officer is the point of contact for representatives of other governmental agencies, non-governmental organizations, and/or private entities involved with the incident response.