What is the primary danger of downshifting rapidly into a very low gear at high speed without matching engine RPM?

1. The rear tire will break traction, chirp, and skid (compression lockup), causing a severe slide or crash
2. The gearbox will refuse to engage the lower gear, leaving the machine in neutral
3. The front wheel will lift under the sudden change in drive
4. The engine will stall immediately and cut all electrical power