Mbalula, a buyer at a cell phone retail store, is responsible for the cost control for the retail store. The retail store manager has assigned him The retail store manager has assigned him task of comparing prices and sourcing costs from various suppliers for cell phones, compare the prices and cost of sourcing cell phones from different suppliers. This is known as ... a. Market research b. Maintaining and improving quality c. Price/cost analysis d. developing contract and negotiating with suppliers