Question 2086 Deck General

The correct answer is D) the head line. The head line is the complement of the stern line. The head line is a line secured at the bow of the vessel, while the stern line is a line secured at the stern. Together, the head line and stern line provide the primary longitudinal securing points for a vessel when it is moored. The other options are incorrect because they refer to different lines used for securing a vessel, but they are not the direct complement of the stern line. The breast line secures the vessel laterally, the quarter cross spring line and bow cross spring line are used to control the vessel's movement, but they do not directly correspond to the stern line.