Final answer:
A device or technique that ensures the production of a good unit every time is known as poka-yoke, which is part of the Toyota Production System and is used for error-proofing the manufacturing process. Hence, option (D) is correct.
Step-by-step explanation:
A device or technique that ensures the production of a good unit every time is a poka-yoke. The concept of poka-yoke was developed as part of the Toyota Production System and is aimed at error-proofing the manufacturing process. By designing mechanisms that prevent errors or provide immediate feedback on errors, poka-yoke helps in achieving zero defects in manufacturing. It ensures that all products are produced without defects and meet quality standards consistently.
For example, a jig that only allows parts to be installed in the correct orientation is a form of poka-yoke. It prevents assembly errors by making it impossible to assemble components incorrectly. As another example, modern software often includes features that require fields to be filled in before moving on to the next step, which is a digital form of poka-yoke.