Which pricing model did Wolfram Alpha Pro first introduce that transformed how advanced mathematical computation tools are sold to educational institutions?

In the competitive world of mathematical software, pricing strategies play a crucial role in market penetration and customer retention. From advanced statistical packages to educational math platforms, how companies price their products can significantly impact their success. This poll tests your knowledge about a notable pricing innovation that revolutionized accessibility to professional-grade mathematical software.

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Graduated licensing based on problem complexity tiers
Site-wide subscription with usage-based dynamic pricing
Perpetual license with annual maintenance fees
Freemium model with computational time limitations