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The correct answer indicates that the anti-collision light system must be operational anytime an engine is in operation. This requirement is rooted in safety protocols, which mandate that the system, designed to enhance the visibility of the aircraft and prevent collisions, be active during any phase where the aircraft may move or be at risk of collision.

When engines are running, the aircraft is not stationary and may be maneuvered on the ground, potentially interacting with other aircraft, vehicles, and personnel. The anti-collision lights serve as a critical warning system for others in the vicinity, ensuring that they are aware of the aircraft’s presence.

Moreover, these lights are not limited to only nighttime operations or solely before takeoff, as situations could arise where visibility is compromised, or ground movement occurs during the day. Therefore, having the anti-collision light system on whenever the engines are functioning addresses a comprehensive safety mindset. This measure is taken to reduce the risk of accidents and ensure clear communication of the aircraft's status to others around it.