Please choose the correct ending to complete the given sentence: Assembling bicycle: A person is putting something on a chain of a bike. They use a blue tool to take the chain apart. they

Ending1: continue piecing together the chains to make a bike. Ending2: put it back together using a tool. Ending3: plug all of the holes in the chain and wipe off any excess parts. Ending4: tape down the piece where the chain is attached.

Answer format: ending1/ending2/ending3/ending4