Forming a hypothesis is part of a scientific investigation but is not part of the engineering design process. Thus option D is correct.
The first step involved in define the problem by asking the right questions.
Conduct research and competitive analysis; Brainstorm and conceptualize the specific requirements, ideas and compare ideas.
Create a prototype which is similar to finished product and testing of prototype to clarify answers to important questions
Select and finalize, followed by product analysis.
Improve the gathered feedback, prototype testing, competitor analysis.
Thus option D is correct.
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