For the network in the figure below, calculate: a. The minimum cost spanning tree. In this case the number in parentheses above the arc represents cost. b. The maximum flow between nodes s and t. In this case the number in parentheses above the arc represents flow S (14) (7) (8) (16) (8) (6) (9) (12) (6) (4) (10) (8) (8) (12) (8) (6) (9) (5)