Required: Classify the cost items below as one of the business functions of the value chain provided above: (10 pts) A pharmaceutical company incurs the following costs: 1 Payment of booth registration fee at a medical conference to promote new products to physicians 2. Cost of redesigning an artificial knee to make it easier to implant in patients 3. Cost of a toll-free telephone line used for customer inquiries about drug usage, side effects of drugs, and so on 4. Materials purchased to develop drugs yet to be approved by the government 5. Labor costs of workers in the tableting area of a production facility