On an older ABS-equipped school bus, the ABS lamp remains on while the bus is barely moving but goes out after the bus exceeds 5 mph. What does the Georgia CDL manual indicate?

1. Some older systems may keep the lamp on until the bus is driven over 5 mph
2. The bus has automatically failed its post-trip inspection
3. The driver must pump the brakes until the lamp flashes red
4. The ABS has replaced the need for normal brakes