Which subscription model innovation significantly transformed the accessibility of advanced mathematical software for educational institutions around 2015-2016?

The market for mathematical software has evolved dramatically in recent decades, transforming how educators, researchers, and professionals approach complex calculations and visualization. These tools have not only enhanced computational capabilities but also changed how mathematics is taught and applied across industries. This poll tests your knowledge about a significant retail trend in the mathematics software industry that revolutionized access to powerful computational tools.

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The introduction of MathWorks' campus-wide license model for MATLAB, allowing unlimited student access based on institution size rather than per-seat licensing
Wolfram's introduction of free basic access to Mathematica with premium features available through microtransactions
The launch of GeoGebra's blockchain-based tokenized access system that rewarded educational content creators
SageMath's introduction of a freemium model with cloud computation credits that could be purchased or earned through contributing to open-source development