Under a poka$-$yoke system to improve quality, which of the following problem resolving approaches can we utilize?$*$

$12)$ Under a poka$-$yoke system to improve quality, which of the following problem resolving approaches can we utilize?$*$

A$)$ Improving work procedures

B$)$ Preventive maintenance

C$)$ Constant monitoring of equipment

D$)$ All of the above

E$)$ None of the above