Please choose the correct ending to complete the given sentence: Assembling bicycle: The man shows an electric piece of equipment then fastens it to the seat post. The man removes the handlebar grips and slides on electrical controls. the man

Ending1: quickly removes the safety tools and straps the bike up. Ending2: walks to the other side and secures the wheel horses harness then removes his helmet to speak to the camera. Ending3: watches over his shoulder as he fastens the cabinet attachment. Ending4: installs a headlamp to the bike.

Answer format: ending1/ending2/ending3/ending4