Question 5 to Question 7 is based on this problem. American Red Cross wants to determine the least expensive way to transport available blood donations from Pittsburgh and Staunton to hospitals in Charleston, Roanoke, Richmond, Norfolk, and Suffolk. The supply and demand for donated blood is shown the following figure along with the unit cost of shipping along each possible arc: Let Xij be the amount of blood donations shipped from node i to node j. Which statement about the balance of flow constraint is not true? A. X13+X141,300 is the balance of flow constraint for node 1. B. X35800+X56 is the balance of flow constraint for node 5 . C. X47+X67400 is the balance of flow constraint for node 7. D. X36+X46+X56+X67700 is the balance of flow constraint for node 6. Question 7 1 pts Let Xij be the amount of blood donations shipped from node i to node j. Solve this problem using Excel. Which statement about the optimal solutions is not true? A. X14=1,300 B. X35=800 C. X46=1200 D. The minimized total cost is $20,900