What is the primary advantage of adopting an active 'Lean-In' (body leaning into the corner) riding posture during brisk road cornering?

1. It makes the motorcycle 50% lighter in total physical mass
2. It cools the rear tire by exposing the tread to oncoming wind
3. It shifts the combined center of mass inward, allowing the motorcycle itself to remain more upright with a larger tire contact patch and greater ground clearance for the same cornering speed
4. It eliminates the need to use counter-steering to initiate turns