Q-4: Below are listed a number of activities that are part of a company's quality control system: a. Repairs of goods still under warranty. b. Customer returns due to defects. c. Statistical process control. d. Disposal of spoiled goods. e. Maintaining testing equipment. f. Inspecting finished goods. Required: 1. Classify the costs associated with each of these activities into one of the following categories Prevention cost Appraisal cost Internal failure cost, or External failure cost