Please choose the correct ending to complete the given sentence: Playing piano: An asian man is standing by the keyboard, he is wearing a red shirt with black top inside. two people, one girl and one boy

Ending1: are sitting behind the keyboard, playing. Ending2: , are playing loudly on the keyboard together. Ending3: are sitting, the girl is wearing a white top, while the boy is wearing a white stripe sweater. Ending4: are dancing and the keyboard man behind him thumbs the keyboard.

Answer format: ending1/ending2/ending3/ending4