The correct answer is B) You should never rely on a floating aid to maintain its exact position. This is because floating aids to navigation, such as buoys, are subject to the effects of wind, waves, and currents, which can cause them to drift from their charted positions. Navigators should always verify a buoy's position visually and by comparing it to other navigation references, rather than assuming the buoy is exactly where it is supposed to be. The other answer choices are incorrect because: A) Buoys may not always display the proper light characteristics, especially if they have been damaged or displaced. C) A wreck buoy may not be directly over the wreck, as it is meant to mark the general vicinity. D) Buoys can and do drift from their assigned positions, so they should not be relied upon to be exactly on station.