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The minimum required visibility for a flight with a ceiling of 600 feet is indeed 3 kilometers. This is based on regulations that provide specific visibility requirements depending on the airspace and conditions under which the flight is conducted.

In controlled airspace and for VFR (Visual Flight Rules) operations, certain visibility thresholds are mandated to ensure that a pilot has sufficient visual reference to maintain safe separation from terrain and other aircraft. A ceiling of 600 feet implies that the pilot must have adequate visibility to navigate safely and respond to visual cues.

3 kilometers of visibility provides a reasonable distance for pilots to operate effectively at lower altitudes, particularly when maneuvering around obstacles such as buildings or terrain, which can be critical near airports or in built-up areas.

The other visibility options either exceed what is necessary for this ceiling or do not meet regulatory standards for safe VFR operations in this scenario.