Please choose the correct ending to complete the given sentence: BMX: A group of dirt bikers are prepared at the gate. the gate

Ending1: opens and the dirt bikes begin to race with each other in an energetic race. Ending2: is pulled down, and a ramp is attached. Ending3: is opened and they start a race on bikes. Ending4: opens, and they take off.

Answer format: ending1/ending2/ending3/ending4