Please choose the correct ending to complete the given sentence: Welding: An individual wearing a protective mask welds something on a table. the individual

Ending1: welds the left hand of a young man while talking in a crowded environment. Ending2: stops welding and puts the tool down. Ending3: welds several filings into a surface. Ending4: welds metal pieces throughout a metal box.

Answer format: ending1/ending2/ending3/ending4