Which pricing innovation first dramatically increased student access to professional-grade mathematical software in the 1990s?

The world of mathematical software has seen various innovative pricing strategies over the decades. From educational discounts to tiered licensing models, companies have continuously evolved how they monetize these specialized tools. One pricing innovation in particular revolutionized accessibility to professional-grade mathematical software for students and educators. Test your knowledge about this influential pricing strategy that changed the mathematics software landscape.

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Site-based concurrent user licensing with educational discounts
Freemium model with limited equation solving capabilities
Subscription-based pricing with monthly payments
Hardware-bundled licenses that came pre-installed on graphing calculators