Please choose the correct ending to complete the given sentence: Bullfighting: A bull is chasing after men in a pen. a bull

Ending1: attacks a man who is running. Ending2: charges a man on a horse. Ending3: knocks a man down onto the ground. Ending4: is chasing a man wearing sunglasses who falls amidst the commotion.

Answer format: ending1/ending2/ending3/ending4