Final answer:
The last step in the design process is to implement the solution by building a prototype, testing and evaluating it, and making necessary modifications to finalize the product.
Step-by-step explanation:
The last step in the design process is to implement the solution. After brainstorming alternative solutions, evaluating and selecting the best design concept, and refining the design to meet criteria and constraints, the final step is to actually put the chosen design into action. This involves building a prototype, testing and evaluating it, and making any necessary modifications to finalize the product.