Q:United States N-class submarine - The United States N class submarines were a class of seven coastal defense submarines of the United States Navy.The boats were constructed by two companies to slightly different specifications; N-1 N-2 and N-3 were designed by the Electric Boat Company of Groton Connecticut and built by the Seattle Construction and Drydock Company of Seattle Washington and N-4 N-5 N-6 and N-7 were designed and built by the Lake Torpedo Boat Company of Bridgeport Connecticut. Given a choice of categories company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work, the text refers to which one?
A:
Mean Of Transportation