Final answer:
The Incident Command System (ICS) is used for emergency response, with the incident commander responsible for all command and staff functions unless they are delegated as the situation expands.
Step-by-step explanation:
The Incident Command System (ICS) is a standardized approach to the command, control, and coordination of emergency response. The incident commander is primarily responsible for all aspects of the response, including developing incident objectives, managing incident operations, and applying resources as needed. However, the incident commander performs all major ICS command and general staff responsibilities only until these functions, such as operations, planning, logistics, and finance/administration, are activated and assigned to others.