Which phase allows firefighters to regain control of the elevator during an emergency?

Phase II is the correct answer because it specifically allows firefighters to regain control of the elevator during an emergency situation. In this phase, firefighters can operate the elevator system directly using a key switch or control panel located within the elevator hoistway or lobby. This capability is crucial during emergencies, as it empowers firefighters to move to different floors safely and efficiently without relying on normal elevator operations, which may be compromised or unsafe due to smoke, fire, or power outages.

In contrast, Phase I is primarily designed for the elevator to return to the designated landing (often the ground floor) and remain there, effectively removing it from service during a fire or emergency. The Emergency Phase is essentially synonymous with Phase I, focusing on the automatic recall of the elevators. The Rescue Phase is not a standard term used to refer to more specific operations or controls of elevator systems in firefighting, which further clarifies why it is not the correct choice. Understanding these phases is essential for safely navigating elevator operations in emergency situations, particularly for ensuring the safety of both firefighters and civilians.