If a strong burning electrical or plastic smell is detected in the cabin while driving a passenger bus, what must the driver do immediately?

1. Pull over immediately in a safe location, stop, turn off the engine ignition, disconnect the master electrical battery switch, evacuate passengers, and inspect electrical wiring harnesses with a fire extinguisher at hand
2. Turn the cabin heater and air conditioning blower to maximum speed to blow the smell away
3. Continue driving to the final destination while opening all windows
4. Pour water directly over the dashboard fuse box while driving