What is the correct seating of an additional passenger on the motorcycle?

1. AThe passenger sits on a proper seat, with his feet placed on the footrests on both sides of the motorcycle, and holds a grab handle or the driver.
2. BThe passenger sits behind the driver, bent forward, and holds the fuel tank.
3. CThe passenger sits in front of the driver, bent forward, and holds the fuel tank or the handlebar.
4. DThe passenger sits on a proper seat, with the body upright leaning back, and holds the rack installed at the rear part of the motorcycle.

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