The Door Company manufactures doors. Classify each of the following quality costs as prevention costs, appraisal costs, internal failure costs, or external failure costs.
a. Retesting of reworked products
b. Downtime due to quality problems
c. Analysis of the cause of defects in production
d. Depreciation of test equipment
e. Warranty repairs
f. Lost sales arising from a reputation for poor quality
g. Quality circles
h. Rework direct manufacturing labor and overhead
i. Net cost of spoilage
j. Technical support provided to suppliers
k. Audits of the effectiveness of the quality system
l. Plant utilities in the inspection area
m. Reentering data because of keypunch errors