An employee assistant must answer from internal procedures that change every week. The team wants to use current approved sources without retraining the foundation model for each document update. Which approach best fits?

1. Increase temperature so the model invents more recent-sounding procedures.
2. Fine-tune the model once and assume its weights automatically include every later procedure revision.
3. Retrieval Augmented Generation using an updated, access-controlled knowledge source.
4. Use only the original model pre-training knowledge and omit the internal source collection.