Please choose the correct ending to complete the given sentence: Washing hands: A man in a white lab coat is seen talking to the camera and showing various tools in a laboratory. towel

Ending1: cleaning is shown by hand and a man works on an inner tube with various tools laid out for him. Ending2: are seen sitting in a sink and the man shows the proper hand washing tools. Ending3: cleans and with a violin played makes measurements of the instrument making instructions. Ending4: scraping is seen on the floor in front of him as he continues to speak.

Answer format: ending1/ending2/ending3/ending4