Which 1980s invention revolutionized product design by allowing designers to create and modify digital models in three dimensions, largely replacing physical prototyping?

The world of product design has evolved dramatically through groundbreaking inventions and discoveries. Some tools revolutionized how designers conceptualize and create products, fundamentally changing entire industries overnight. This poll tests your knowledge of a pivotal moment in product design history that transformed the creative process for designers worldwide. Do you know which technological advancement fundamentally altered the product design landscape?

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Computer-Aided Design (CAD) software
Digital scanning electron microscope
Graphical User Interface (GUI)
Digital photography