Please choose the correct ending to complete the given sentence: Fixing bicycle: A man stands with a bicycle on a rack and shows its different parts and features including the wheels. the man

Ending1: starts the bike and a timer goes off. Ending2: turns the crank and the wheel spins on the bike. Ending3: then mounts the aluminum apparatus and begins removing the handles, wheels and connection gear in one place. Ending4: applies a soap and a sponge and sanitizes it thoroughly.

Answer format: ending1/ending2/ending3/ending4