If the ABS malfunction lamp stays on after the bulb check or comes on while driving, what should the driver understand?

1. ABS control may be lost at one or more wheels, but regular brakes still work and the system should be serviced soon
2. The bus has no brakes at all and must be abandoned immediately in traffic
3. The driver should pump the brakes hard at every stop to reset ABS
4. The bus can be driven faster because ABS is active