Wilson's Tax Service is tracking costs of quality. Classify each of the following as Prevention (P), Appraisal or Inspection (AI), Internal Failure (IF), or External Failure (EF) costs. 1. Review of tax return for missing items/errors. 2. Training of employees on new tax software. 3. Correction of errors found on review of tax returns. 4. Reprinting of corrected tax returns. 5. Legal costs resulting from lawsuits related to incorrect tax returns