Please choose the correct ending to complete the given sentence: Welding: A person stands next to a black box in a metal helmet as fire sparks erupt from a wired box on the right. a large grey wheel

Ending1: of steel falls down from a ceiling. Ending2: spins behind the worker in the midst of the fire sparks and another worker walking by in a blue protective suit. Ending3: is pulled out of a driven plant and a set of welding tools are shown. Ending4: lights rocket into motion and start quickly turning, until the timer begins and begins to spin with fast motion.

Answer format: ending1/ending2/ending3/ending4