21 - A distribution warehouse is to be located with respect to five demand centers. The coordinates of these demand centers (in kilometers) and the amount of products to be sent from the warehouse to these demand centers are given below. Demand Centers X Y Products Coordinate Coordinate Required 20 20 1250 1 2 100 40 1500 3 120 160 500 4 80 80 1000 5 160 120 2000 What would be the optimum location (X and Y coordinates) of the warehouse, which minimizes total shipment costs? (Assuming shipment cost per unit per kilometer is 1.0 TL) a) X=120; Y=80 b) X=80; Y=80 c) X=80; Y=100 d) X=100; Y=80 e) X=120; Y=120