Please answer the following question: Soviet submarine B-427 - B-427 was a Project 641 (Foxtrot-class) diesel-electric attack submarine of the Soviet Navy. The B (actually ) in her designation stands for (bolshaya large). Commissioned in 1971 the submarine operated with the Russian Pacific Fleet until decommissioning in 1994. 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