Please choose the correct ending to complete the given sentence: Brushing teeth: . a young boy dressed in shorts and a t - shirt

Ending1: stands beside a fooseball table pushing a child's pool cue. Ending2: is standing in a bathroom with his left foot on a colorful mat and his right hand on the sink, and he's brushing his teeth with his left hand. Ending3: is jumping on an elliptical machine that has a large screen of images on it. Ending4: serves tennis tennis ball against another man in a locker room.

Answer format: ending1/ending2/ending3/ending4