Please choose the correct ending to complete the given sentence: BMX: Several dirt bikers are standing under a garage behind a stand preparing to race. someone

Ending1: is let loose by a crowd and they take off on a dirt bike. Ending2: is costumed in paint and is riding on a dirt bike. Ending3: is then shown speaking and clips of a track like polo are shown. Ending4: calls a mark and they all stand up on their pedals preparing to be released.

Answer format: ending1/ending2/ending3/ending4