During the engine compartment pre-trip inspection of a light motor vehicle, what four fluid levels must the candidate identify?

1. Engine oil, radiator coolant, brake fluid, and windscreen washer fluid
2. Engine oil, gearbox oil, power steering fluid, and fuel level
3. Radiator coolant, battery acid, windshield fluid, and transmission fluid
4. Brake fluid, clutch fluid, differential oil, and engine oil