For a manufacturing business, the value chain does NOT include which of the following activities? Question 8 options: a) The purchasing manager orders 10,000 kilograms of silica, which is a raw material used in manufacturing mirrors. b) An engineer tests a variety of different materials in the development of a new metallic coating that will provide a clearer image in the company's mirror products. c) The CEO and CFO perform an evaluation of each activity in the value chain to understand which costs add the most value to the products. d) Customer service representatives answer customer questions and complaints using a chat program or by phone