Bright Star Distributors supplies holiday wreathes to three retail stores in a three county vicinity. The company purchases wreathes from two suppliers: ABC Crafts and Amazing Pine. Demand forecasts for the upcoming holiday season are as follows: Central City; 400 units, Vidalia; 200 units, and Ashton: 300 units. Contracts to provide the following quantities have been written: ABC Crafts, 500 units, and Amazing Pine, 400 units. Distribution costs for the customers vary, depending upon the location of the suppliers. The distribution costs per unit (in thousands of dollars) are as follows: TO FROM Central City Vidalia Ashton ABC Crafts $10 $20 $15 Amazing Pine $12 $15 $18 a) Develop a network representation of this problem. b) Develop a linear programming model that can be used to determine the plan that will minimize total distribution costs