When accelerating out of a corner, at what point should the rider begin rolling on progressive throttle?

1. Before initiating the turn while entering the corner at maximum speed
2. While the motorcycle is leaned at maximum lean angle over a wet painted crosswalk
3. Only after coming to a complete stop on the straightaway
4. As the motorcycle passes the corner apex and begins to stand up toward an upright position, where available traction shifts from cornering grip back to acceleration grip