Which feature of Desmos graphing calculator led to its explosive growth, becoming one of the most successful product launches in mathematics education software?

The mathematics education software market has seen remarkable growth in recent years with innovative products changing how we teach and learn complex concepts. Product launches in this specialized field require unique strategies due to the technical nature of the subject matter and the specific needs of educators and students. Test your knowledge about one of the most successful product launches in mathematics education software history!

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Its real-time collaborative functionality allowing multiple students to work on the same graph simultaneously
Its free, web-based accessibility that eliminated the need for expensive graphing calculators
Its integration with major standardized testing platforms like SAT and ACT
Its advanced 3D graphing capabilities that surpassed traditional graphing calculators