Which product development approach did Desmos use to revolutionize their graphing calculator and gain over 40 million monthly users?

In the world of mathematical software and educational tools, product development follows specific methodologies to ensure accuracy and educational value. This trivia question explores how leading mathematical product developers use data-driven approaches to enhance their offerings. Test your knowledge of how mathematical product innovation intersects with market research!

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They focused exclusively on adding advanced calculus functions that competitors lacked
They used iterative user testing with students and teachers to create an intuitive, accessible interface
They prioritized 3D graphing capabilities over all other features
They eliminated free access and focused solely on premium subscription models