Operational aids such as a level indicator or load-moment system are found to be inoperative before a shift. According to the operation knowledge requirements, what should the operator do?

1. Operate normally; aids are optional decorations
2. Follow the alternative/temporary measures permitted by the rule (e.g., specified procedures and time limits to repair) and not rely on the failed aid
3. Disable all remaining aids to match
4. Remove the operator's manual from the cab