Pick one category for the following text. The options are - company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work. Acciaio-class submarine - The Italian Acciaio class submarine (also sometimes called Platino class) was the fifth subclass of the 600 Series of coastal submarines built by the Regia Marina. They were completed during the early 1940s and saw service in World War II. The Acciaio's were a development of the Adua and Perla designs with some improvements such as a lower conning tower to improve stability and reduce the silhouette.
Answer:
Mean Of Transportation