Please choose the correct ending to complete the given sentence: Playing piano: A boy sits down at a keyboard in a room. The person plays a song on the keyboard. the friends

Ending1: shake hands and hug. Ending2: walk along a sidewalk and wave at a passerby. Ending3: watch as the boy plays a song. Ending4: dance and clink glasses at each song.

Answer format: ending1/ending2/ending3/ending4