Which is an example of a design based on the fool-proof concept?

Answer: C. Making a connector's shape asymmetric so that it cannot be inserted the wrong way round

Fool-proofing is the design concept of ensuring that incorrect human operation does not lead to a hazardous state or malfunction, or that incorrect operation is not possible in the first place. A connector shaped so that it cannot be inserted the wrong way round is a typical example that physically prevents a wrong connection. Writing data to two disks is fault tolerance through redundancy, and reducing failures through regular inspection and replacement is the fault-avoidance concept.

• A. This is fault tolerance, keeping the function despite failures through redundancy.
• B. This is fault avoidance, making failures themselves less likely.
• C. Correct. The shape prevents connecting it the wrong way round.