How should a driver adjust the seat distance to achieve optimal pedal control in a manual transmission car?

1. Position the seat as far back as possible so the legs are locked completely straight
2. Position the seat so the knees press firmly against the lower dashboard panel
3. Position the seat so the left leg retains a slight bend at the knee when the clutch pedal is fully depressed
4. Position the seat so only the tips of the toes can reach the accelerator pedal