In the context of vehicle electric powertrains (EVs), what is 'One-Pedal Driving' and what must driving instructors highlight to students regarding brake lights?

1. Using regenerative braking when the accelerator is released; instructors should explain that brake-light behaviour depends on the vehicle's approved control logic and deceleration, and learners must know the vehicle rather than assume the lamps are always on or always off
2. Coasting in neutral whenever the accelerator is released, so neither the motor nor the service brakes slow the vehicle
3. Using regeneration only after the service-brake pedal is pressed fully, with no deceleration on accelerator release
4. Using accelerator release as the sole braking method in every situation, including an emergency stop