Which marketing campaign first successfully positioned graphing calculators as essential educational tools rather than luxury items, dramatically increasing their adoption in schools during the 1990s?

Throughout history, marketing campaigns and product advertising in the mathematics industry have evolved dramatically. From the early days of selling slide rules and compasses to today's advanced graphing calculators and digital math learning platforms, companies have employed various strategies to gain market share. This trivia question explores a significant milestone in mathematics product marketing that changed how these tools were perceived and sold to the public.

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Texas Instruments' "Push The Button" campaign that emphasized ease-of-use for all students
Casio's "Math For The Masses" campaign that focused on affordability and accessibility
HP's "Precision Engineering" campaign highlighting professional-grade calculation capabilities
Sharp's "Classroom Revolution" campaign featuring testimonials from leading mathematics professors