Please choose the correct ending to complete the given sentence: Assembling bicycle: A set of instruction is seen with diagrams. A man uses a tool to repair individual links of a bike chain. the bike chain

Ending1: is too long to replace. Ending2: is fastened back together on the bike gears using a specialized tool. Ending3: is then bent, and a man uses pliers to fix the chain. Ending4: is then reassembled before a tutorial.

Answer format: ending1/ending2/ending3/ending4