Final answer:
The Implementation stage is where the system is prepared and put into production, encompassing activities from prototype development to refining the design and manufacturing the product.
Step-by-step explanation:
The stage that best represents the preparation and completion of placing a system into production is Implementation. During Implementation, the plans set out in the design phase are translated into a tangible product or system. This involves creating various models or prototypes, refining the design as necessary, and building the actual product. Key activities at this stage might include developing a manufacturing system, identifying suppliers for components, and refining the design to meet constraints and criteria.
Furthermore, Implementation also accounts for unforeseen challenges that require design flexibility. Once a design has been adequately refined, and a prototype or physical model has been built, the focus shifts to the logistics of manufacturing, marketing, and distributing the final product.