Which marketing strategy revolutionized the calculator industry when Texas Instruments repositioned their graphing calculators in the 1990s?

In the competitive world of educational mathematics products, companies employ various marketing strategies to differentiate themselves. From highlighting unique pedagogical approaches to emphasizing research-backed results, mathematics product companies must carefully position their offerings. This trivia question focuses on a significant marketing shift that revolutionized how mathematics learning tools were positioned to consumers.

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Positioning calculators as required educational tools rather than optional accessories
Introducing subscription-based calculator software with monthly updates
Creating limited-edition designer calculator cases with celebrity endorsements
Implementing a buy-one-give-one charitable model for developing countries