Please choose the correct ending to complete the given sentence: Fixing bicycle: A woman looks into a camera and smiles while talking before the scene cuts away to a pair of hands working on a bike chain. a pair of hands

Ending1: work on a bike chain with tools and bolts. Ending2: tighten the chain, and the shiny metal resumes its work. Ending3: opens the chain and takes out a soldering iron that catches and makes an iron on the bike chain. Ending4: start a bike chain chain, pumping it up and down and then down.

Answer format: ending1/ending2/ending3/ending4