The Cost-Less Corp. supplies its four retail outlets from its four plants. The shipping cost per shipment from each plant to each retail outlet is given below Unit Shipping Cost Retail Outlet: 1 2 3 4 Plant 1234 $500 $600 $400 $200 200 900 100 300 300 400 200 100 200 100 300 200 Plants 1, 2, 3, and 4 make exactly 10, 20, 20, and 10 shipments per month, respectively. Retail outlets 1, 2, 3, and 4 need to receive 20, 10, 10, and 20 shipments per month, respectively. The distribution manager, Randy Smith, now wants to determine the best plan fo how many shipments to send from each plant to the respective retail outlets each month. Randy's objective is to minimize the total shipping cost. There are X 4 resource constraints, X 4 benefit constraints, and X 4 fixed-requirement constraints in this problem.