Which innovative pricing model did Wolfram Alpha Pro introduce that transformed how advanced computational mathematics tools are monetized?

In the world of mathematics education products, pricing strategies often reflect the unique market dynamics of educational tools. Publishers and EdTech companies must balance accessibility with profitability while considering the specialized nature of their products. This poll tests your knowledge about a notable pricing innovation that revolutionized how advanced mathematics software is sold to educational institutions and individual learners.

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Computation-based pricing (charging per mathematical operation performed)
Tiered subscription model with academic discounts and API access options
Formula complexity pricing (higher costs for more advanced equations)
Proof-based licensing (free until mathematical proofs are generated)