The Azure Apparel Company is a renowned maker of high-quality clothing. After the clothes are manufactured at Azure's two factories, they are checked for quality and then stored until they are needed by Azure's retail outlets. Currently, Azure Apparel has three retail outlets located in three different cities. The table below shows that each factory (source) and retail outlet (destination) has different demands, and the cost of transportation varies due to distances and traffic conditions. Destination Source 1 2 3 Supply 1 6 7 4 40 2 5 8 6 60 Demand 30 40 30 a. Draw a network that depicts the company's distribution network. Identify the supply nodes, demand nodes, unit shipping costs, supply volumes and demand volumes in this network. b. Formulate and solve a spreadsheet model for this