Please choose the correct ending to complete the given sentence: Welding: A welding tool is applied to a surface. A guy that is holding a welding tool is wearing a helmet. two gloved hands

Ending1: grabs their tool from the floor. Ending2: are using a welding gun and stick on an object. Ending3: then enter into the welding environment. Ending4: are measuring metal beams.

Answer format: ending1/ending2/ending3/ending4