Which pricing strategy revolutionized the accessibility of advanced graphing calculators in educational markets during the 2010s?

The world of mathematical education and tools has evolved dramatically over the decades, with pricing strategies reflecting these changes. From traditional textbooks to advanced software solutions, companies have employed various approaches to monetize mathematical tools. This trivia tests your knowledge about how mathematical products have been priced and marketed to different segments - from academic institutions to individual learners.

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Subscription-based licensing model allowing schools to pay annually rather than purchasing devices
Tiered pricing structure based on the mathematical complexity level of the calculator
Cross-subsidization where basic calculators were free but advanced functions required in-app purchases
Premium bundle pricing where calculators were sold exclusively with textbook packages