Which design feature, first introduced by GeoGebra in 2002, revolutionized mathematics education software by making it more accessible to students?

The educational technology landscape has transformed how mathematics is taught in classrooms worldwide. Among various mathematical software products, one stands out for revolutionizing how students visualize and interact with complex mathematical concepts. This poll tests your knowledge about a pivotal product development decision that significantly impacted mathematics education and software design principles for educational tools.

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Combining dynamic geometry, algebra, and calculus in a single, integrated interface
Subscription-based access model with graduated pricing tiers for different education levels
Cloud-based storage system for student work with teacher feedback capabilities
3D graphing functionality with touch-screen manipulation