Please choose the correct ending to complete the given sentence: BMX: An introduction comes onto the screen for a video about bmx riding. several bmx riders

Ending1: show off their skills and impressive skills in the beginning of their competition. Ending2: are shown on multiple adult bikes on a track. Ending3: are shown doing tricks and riding on the track. Ending4: are shown, kickboarding as well as lift each others legs and continue to ride around.

Answer format: ending1/ending2/ending3/ending4