Which Statement Is True Concerning Internal Failure Costs

Which statement is true concerning internal failure costs?

A) Internal failure costs are incurred to prevent defects in the products or services being produced.
B) Internal failure costs are incurred to detect individual units of products that do not conform to specifications.
C) Internal failure costs are incurred when the firm discovers nonconforming products and services before delivery to customers.
D) Internal failure costs are incurred when the customers discover nonconforming products and services at delivery.