The correct answer is D) All of the above when so equipped. This is the correct answer because the options provided (holding the towing hawser in the median position by a gob rope, fairleading it through a stern roller chock, and leading it through the Norman pins) are all acceptable ways to lead the towing hawser over the center of the stern when not under strain, as long as the vessel is equipped with the necessary hardware to do so. The other options are incorrect because they only specify a single method, when in reality the vessel may have multiple ways to properly lead the towing hawser depending on its configuration and equipment.