Which pricing strategy did Wolfram Research implement in 1991 that revolutionized the mathematical software market with its flagship product Mathematica?

The world of mathematics education has its own unique marketing and product challenges. From textbooks to advanced software, companies compete to provide the best tools for learning and applying mathematical concepts. This trivia question explores how a famous mathematical software company used pricing psychology to revolutionize the academic software market in the 1990s.

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Versioned pricing with educational discounts up to 90% off retail price
Freemium model with advanced features requiring paid subscription
Pay-per-calculation model with bundled computation credits
Open source core with enterprise support packages