Please choose the correct ending to complete the given sentence: Welding: A person puts on a welding helmet. then

Ending1: , the person puts on a welding tool and talks. Ending2: , the person weld a piece of metal. Ending3: , several people are welding something in the center of a red metal circle. Ending4: , the person weld welding helmet on a bull.

Answer format: ending1/ending2/ending3/ending4