Final answer:
The first step of the lean product process is to D) identify a problem or a need, which involves understanding customer requirements and establishing the scope of the design project.
Step-by-step explanation:
The lean product process begins with D) identifying a problem or a need.
This is the first step where the needs of potential customers are investigated and a clear understanding of the design project's scope is developed.
It involves defining the problem, which sets the stage for all subsequent steps in the lean product process.
Following this initial phase, the process involves defining requirements and constraints, generating ideas, evaluating possible solutions, designing and building a prototype, testing and refining the prototype, and communicating the final results.