After printing a new MDL, the old MDL may be...

• A. Archived for reference
• B. Discarded
• C. Kept for one year
• D. May be discarded

Answer: (D)

Document control and supersession: when a new MDL is printed, the old MDL is superseded by the updated document. In practice, you want to rely on the current data, so the old copy can be discarded to prevent using outdated information. This keeps operations safe and efficient by ensuring everyone works from the latest instructions. You would discard the old MDL unless there’s a specific policy or regulatory requirement to retain it for records or audits. The idea that you must archive or keep a fixed amount of time isn’t universal, and insisting on automatic discard would be too rigid in some settings, hence the flexible “may be discarded.”