Please choose the correct ending to complete the given sentence: Assembling bicycle: The man replaces the tire on the front rim and pumps it up. The man reinstalls the front tire onto the bike frame. the man

Ending1: shows an electric piece of equipment then fastens it to the seat post. Ending2: replaces the bolt back on the chain saw tire. Ending3: removes the tire from the frame and shows it off. Ending4: puts the seat and the briefcase inside the bike frame.

Answer format: ending1/ending2/ending3/ending4