Please choose the correct ending to complete the given sentence: Welding: He begins welding the two plates of aluminum. Then he hits the plates with a hammer and scrubs off the dust. he

Ending1: puts all the aluminum pieces on a plate, takes the aluminum out of the door and removes it in the end. Ending2: uses a welding stick to measure his strategy then starts welding again. Ending3: shows the back side of the plates and how it is welded together. Ending4: then stops for a few seconds and uses a machine to clean off again before dumping the plate to the filter.

Answer format: ending1/ending2/ending3/ending4