During the implementation of the non-fire emergency plan, the movement of elevators shall be controlled either by operation in ___________ by a FLS staff member, or at the elevator control panel located in the lobby.

The correct answer focuses on the operation of elevators specifically during non-fire emergency situations. Operating elevators in manual mode allows trained personnel, such as Fire Life Safety (FLS) staff, to control elevator movement directly, enhancing safety and responsiveness in emergency scenarios. This method reduces the risk that elevators could function unpredictably or in a manner that could expose occupants to danger, especially when conditions are uncertain due to emergencies.

Manual operation gives FLS staff the ability to make real-time decisions based on the evolving situation, which is crucial in emergencies where every second counts. It also ensures that elevators do not inadvertently operate while first responders are accessing different floors, maintaining clear pathways and control as needed.

In contrast, other modes such as automatic mode, emergency mode, or override mode may not provide the same level of direct human control during critical situations where precise management of resources is vital. While these modes have their uses in different contexts, they do not match the safety protocols established for non-fire emergencies as effectively as manual mode does.