Which plan is NOT specifically mentioned as an EMS Response Plan?

The option indicating that EMS Response Plan 1 is not specifically mentioned as an EMS Response Plan is correct because it implies that while the other plans (EMS Response Plan 2, EMS Response Plan 3, and EMS Response Plan 4) are acknowledged and identified, EMS Response Plan 1 does not hold the same recognition in the context of the material being referenced.

This could suggest that EMS Response Plan 1 might either be outdated, revised into another plan, or simply not part of the standards that are set forth for EMS responses in the current operational framework. Therefore, understanding this distinction helps clarify the specific operational procedures and protocols recognized by the Chicago Fire Department regarding emergency medical services.