Listed below are 6 items concerned with quality. Required: Classify each of these items into its appropriate Cost-of-Quality (COQ) category: Prevention Cost; Appraisal Cost; Internal Failure Cost; or External Failure Cost. 1. Establish a 24-hour hot line for customers to report quality failures. 2. Establish a quality-inspection program. 3. Re-design parts and components to simplify manufacturing of the product. 4. Hire additional field service people to provide better services. 5. Extend the warranty period for products from 90 days to one year. 6. Train employees on the importance of zero defects.