Please choose the correct ending to complete the given sentence: BMX: . four bikers at the start of the line

Ending1: get no a jump. Ending2: are wearing different colors of uniforms and helmets, they are about to get start the race. Ending3: leave and race towards a parking lot on the right. Ending4: go on the parallel bars but they can't take off their bikes.

Answer format: ending1/ending2/ending3/ending4