Please choose the correct ending to complete the given sentence: Welding: A woman is shown putting a long metal piece into a large machinery and the words "today's topic: welding" appears on the screen followed by a person wearing a mask and welding with a torch. a woman

Ending1: is now standing at a machine and she is grabbing various metal objects and putting them into a machine that welds them together. Ending2: puts a metal rod into a welded metal one and the report is shown on the screen. Ending3: runs around an area welding the metal piece making several designs on the metal piece as well as talking to the camera. Ending4: is shown welding with another woman under a large metal roof and the same body of metal is shown again until what is inside of it becomes hazy.

Answer format: ending1/ending2/ending3/ending4