Please choose the correct ending to complete the given sentence: Fixing bicycle: And introduction comes onto the screen for a video about how to remove a bike chain. a person sitting next to a bike

Ending1: runs his hands around the chain on it. Ending2: is assembling a handle. Ending3: is about to look at the chain from which it was removed, and he starts swinging his legs around in circles. Ending4: demonstrates how to remove and replace a bike chain using a small tool.

Answer format: ending1/ending2/ending3/ending4