What is required of cabin crew during fueling with passengers on board?

During fueling with passengers on board, it is required that all cabin crew members remain present in the cabin at all times. This ensures that there is adequate supervision and safety management in place while the aircraft is being fueled. The presence of the entire cabin crew serves multiple purposes, including being ready to respond in case of an emergency and maintaining a secure environment for passengers.

In this scenario, the other options do not align with standard safety protocols. While seatbelts may be a consideration during certain phases of flight, the active presence of crew members during fueling is paramount for safety and compliance with aviation regulations. Having only one crew member present is inadequate for managing potential emergencies, and allowing passengers to leave could create safety risks during a critical operation like fueling. Thus, the requirement for all cabin crew to be on board is fundamental to ensuring safety and readiness.