⟩ The Japanese-inspired concept of fail-safe (poka-yoke) seeks to prevent human mistakes. Which of the following are not examples of poka-yoke?
1. Gauges through which parts must pass on a machine
2. Digital counters on machines to ensure all parts are completed
3. Light beams, which activate alarms if errors occur
4. Sampling and checking work in a thorough manner
Sampling and checking work in a thorough manner