Which groundbreaking marketing strategy first made graphing calculators a standard requirement in high school mathematics curriculums across the US?

Throughout history, mathematics products have been marketed in various innovative ways to capture the attention of students, educators, and professionals. From ancient calculating tools to modern digital platforms, the marketing of mathematical products has evolved significantly. This trivia question explores a pivotal moment in mathematical product marketing that changed how educational tools reach their audience.

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Texas Instruments' partnership with AP Calculus exam board to make their calculators mandatory for testing
Casio's free calculator distribution program to mathematics departments in the early 1990s
HP's television marketing campaign featuring famous mathematicians endorsing their calculators
Sharp's strategy of bundling calculators with popular mathematics textbooks at discounted rates