Name the essential fluid levels that must be checked during vehicle prep and the acceptable ranges.

• A. Engine oil, engine coolant, brake fluid, transmission/automatic fluid, power steering fluid, windshield washer fluid; check dipsticks or reservoirs and keep within manufacturer-specified ranges.
• B. Oil and coolant only; other fluids do not require checking before every trip.
• C. Only windshield washer fluid needs to be checked; others are checked annually.
• D. Brake fluid is the only critical fluid; other fluids can be checked if time allows.

Answer: (D)