Which retail innovation fundamentally changed how graphing calculators were marketed to schools in the 1990s?

In the world of mathematics education, products and tools have evolved dramatically over the decades. From basic calculators to advanced statistical software, the retail landscape for mathematical tools has transformed how students learn and professionals work. This poll tests your knowledge about a significant retail innovation that changed how mathematical products are marketed and sold to educational institutions.

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Texas Instruments' teacher training program and classroom sets
Casio's direct-to-student online subscription model
HP's buy-one-get-one-free promotional strategy
Sharp's integrated textbook publishing approach