Classify each of the following quality-related costs as prevention costs, appraisal costs, internal failure costs, or external failure costs. Reworking defective units Litigation costs from product liability claims Inspecting incoming raw materials Training employees Warranty repairs Redesigning the production process Lost productivity due to machine breakdown Inspecting products that are halfway through the production process Incremental cost of using a higher-grade raw material Cost incurred in producing and disposing of defective units