Under Article 70 of the PRC Road Traffic Safety Law, what are the statutory legal obligations of a driver involved in a road traffic accident resulting in casualties?

1. Flee the scene immediately to avoid paying medical fees
2. Negotiate a private cash settlement while leaving the unconscious victim in the road
3. Immediately stop the vehicle, protect the scene, immediately rescue injured persons, promptly report to the public security traffic management department (122), and remain on scene
4. Move all vehicles immediately to the side of the road before taking any photos