15 During solving the transportation problem by using the Stepping-Stone Method, the results of closed paths (closed cycles) were the following First path (closed cycle ) result = 7 A- Second path (closed cycle ) result = -5 B- third path (closed cycle ) result = 3 C- fourth path (closed cycle ) result = -6 D- which path will give the lowest cost of transportation as an optimum solution? write your answer as the the result of the correct path (2 (2 )