What is the primary function of the side stand safety interlock switch found on modern motorcycles?

1. It automatically cuts ignition or stalls the engine if a gear is engaged while the side stand is down, preventing riders from riding away with an extended stand
2. It locks the front wheel so the motorcycle cannot be pushed forward by hand
3. It automatically deploys airbags when the side stand touches the ground
4. It charges the motorcycle battery while parked overnight