Please answer the following question: U-5-class submarine (Austria-Hungary) - The U-5 class was a class of three submarines or U-boats that were operated by the Austro-Hungarian Navy (German: Kaiserliche und Konigliche Kriegsmarine or K.u.K. Kriegsmarine) before and during World War I. The class was a part of the Austro-Hungarian Navy's efforts to competitively evaluate three foreign submarine designs.The design of the boats was based upon John Philip Holland's submarine design and featured a single teardrop hull which resembled the design of modern nuclear submarines. 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