Please answer the following question: Elk (steam tug) -  Elk was a steam tug that operated on Puget Sound and earlier from 1880 to 1896 on Lake Washington under the name of Katherine. 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