Please choose the correct ending to complete the given sentence: Walking the dog: Someone is walking along a snowy sidewalk. a white dog

Ending1: holding on to someone's leg starts chasing the animal. Ending2: is being pulled by a man on a snowboard. Ending3: is brushing snow off of the sidewalk. Ending4: is on a leash in front of them.

Answer format: ending1/ending2/ending3/ending4