What are the limits on popped fasteners?

The limit on popped fasteners is crucial to maintaining the structural integrity and safety of the aircraft. The correct choice states that there should be no corners with popped fasteners, meaning that fasteners located in corner areas of the structure must remain intact since corners typically bear more stress and strain. Additionally, the restriction of no more than two popped fasteners in a row helps to ensure that there isn't a continuous line of structural weakness, which can lead to a failure of the assembly. Finally, the limit of no more than three popped fasteners in total provides a comprehensive check that minimizes potential damage and preserves the aircraft's airworthiness. This combination of restrictions is clearly designed to maintain the structural reliability and safety of the aircraft, which is critical during operations.