An equipment corpus has precise section headings, warning blocks, and procedure steps. Random fixed-character splits separate warnings from the procedures they qualify. Which preparation change is most appropriate?

1. Keep the random boundaries and increase only the answer temperature.
2. Treat every individual character as a separate searchable document.
3. Remove every warning block because it repeats common vocabulary.
4. Split along meaningful sections and preserve headings and associated warnings in chunk metadata or text.