Please choose the correct ending to complete the given sentence: Assembling bicycle: A man attaches a baby stroller to the back of a bicycle. he

Ending1: puts the wheel on the stroller. Ending2: rides around on the spokes. Ending3: adjusts the handle bars, demonstrating how to perform the maneuver. Ending4: balances the stroller onto his back.

Answer format: ending1/ending2/ending3/ending4