Which of the following was the primary reason for abandonment of the inspection system and the adoption of the statistical process control system for achieving quality in the U.S.?

1) People began working in large groups, making the individual-based artisan system obsolete.

2) Customer expectations for high quality were raised by their experiences with French quality during the late 1940s.

3) Manufacturers realized that using inspection to achieve high quality was not as effective as through use of prevention and statistical process control. .

4) Both b and c are correct

5) none of the above