The correct answer is D) None of the above. The primary duty of a lookout is to maintain a vigilant watch and report any sightings or hazards to the officer in charge. While on lookout duty, the regulations do not permit the lookout to perform any other tasks or duties, as this could distract from the critical lookout function. The other answer choices, such as painting, overhauling equipment, or sweeping, would be considered inappropriate and could compromise the effectiveness of the lookout. The lookout must remain focused on their primary responsibility of monitoring the surroundings for the safety of the vessel and crew.