Which innovative marketing strategy led to Desmos graphing calculator becoming a dominant player in mathematics education despite competing with established paid calculator software?

The educational mathematics software market has undergone significant transformations in recent years. Companies have employed various strategies to differentiate their products in this competitive landscape. This poll tests your knowledge about a groundbreaking marketing approach that changed how mathematical software is perceived and sold to educational institutions and individual learners.

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Freemium model with core functionality free for all users, monetizing only through premium classroom features
Exclusive partnerships with textbook publishers requiring students to purchase Desmos subscriptions
Celebrity mathematician endorsements and influencer marketing campaigns on social media
Blockchain-based loyalty program offering cryptocurrency rewards for solving complex equations