A project manager in a manufacturing industry is struggling to ensure that the project requirements including the product requirements are met and validated. In order to ensure high quality standards and efficient cost performance, she is implementing Cost of Quality (COQ) activities. Of the four categories of COQ, which is most cost-effective in maintaining project objectives? (For Ref Only, Question #: PM-03147) Group of answer choices Internal Failure costs Appraisal costs Prevention cost External Failure Costs