In order to effectively manage the company’s value chain, a. the customer service function should focus on offering high-quality products at higher prices. b. the production function should locate customers and persuade them to buy the company's products. c. the materials management function should hold greater inventories in order to avoid shortages. d. the marketing function should focus on customer needs rather than the type of products. e. the sales function should control the movement of physical materials from procurement through customer delivery.