Which pricing strategy did Wolfram Research pioneer in the 1990s that dramatically changed how advanced mathematical software was sold?

Pricing strategies for mathematical software and tools have evolved significantly over the decades. From expensive graphing calculators to sophisticated computation software, companies have used various approaches to market their products. This poll tests your knowledge about a famous pricing innovation that revolutionized how mathematical software was sold to educational institutions and professionals.

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Site licensing model that allowed unlimited users at universities for a flat annual fee
The 'freemium' model with basic functions free and advanced features behind paywalls
Hardware-software bundling where specialized calculators came with proprietary software
Subscription-based pricing with monthly payments instead of large upfront costs