Frontier policy states the Flight Attendants must remain within ____ feet (4 rows) of the cart at all times, unless cart is stowed and secured in the galley.

The correct distance that Flight Attendants must maintain from the cart, as stipulated by Frontier policy, is 10 feet (or approximately 4 rows) when the cart is in service. This guideline is designed to ensure both safety and efficiency during service times while allowing the Flight Attendants to respond promptly to passenger needs and manage in-flight operations effectively.

Keeping a distance of 10 feet provides enough space for Flight Attendants to maneuver safely around the cart, minimizing the risk of accidents or injuries caused by crowding. Additionally, it allows them to maintain a clear path for service and in case of emergencies where quick access to areas is necessary.

Other options such as 5 feet, 15 feet, and 20 feet do not align with the safety and operational standards set by Frontier and may not provide sufficient space for safe maneuverability around the cart or could be unnecessarily excessive for service efficiency.