Immediately upon arriving at or being involved in a motorcycle collision, what is the very first vehicle safety action that should be taken to prevent fire hazards?

1. Turn off the motorcycle ignition switch and hit the red engine kill switch (熄火开关) to cut electrical power and fuel pump operation
2. Open the fuel tank cap to check the remaining gasoline level
3. Rev the motorcycle engine in neutral to warn other drivers
4. Remove the spark plug with bare hands immediately