In the context of elevator recall procedures during a fire, Phase II operation is used by:

Phase II operation of elevator recall procedures is specifically designed for use by trained personnel or first responders. This phase is activated during a fire emergency to ensure that the elevators are used safely and to prevent them from being utilized by building occupants who may be unaware of the dangers involved.

During Phase II operation, the elevators are placed into a special mode that allows firefighters or trained personnel to control their operation. This ensures that elevators do not stop at floors where there may be fire or smoke, helping to safeguard the individuals inside the elevators and allowing for more efficient access for emergency responders.

It's essential that this operation is limited to those trained in its use, as improper operation can lead to dangerous situations in a fire emergency. Only authorized personnel are qualified to make decisions about the elevator's operation in the context of the situation, ensuring that safety protocols are strictly adhered to.

In contrast, other options involve individuals who might not have the necessary training or knowledge to operate elevators safely during a fire, which could potentially endanger their lives and complicate rescue efforts.