A network with two commodities given below. Numbers next to the arcs are upper bounds on the flow and cost per unit respectively (uij,cij). There are 10 units of commodity 1 available at node A to be delivered to node B and 20 units of commodity 2 at node E to be delivered to node F. Consider the optimum flow (minimum cost) and answer the questions accordingly. What is the commodity 2 flow on the arc(E,F)