Which marketing innovation first made advanced graphing calculators a mainstream educational product in the 1990s?

In the world of mathematics education and products, marketing strategies have evolved significantly over the past decades. From traditional textbook publishing to interactive digital platforms, companies have leveraged various approaches to promote mathematical thinking and learning tools. This poll tests your knowledge about a groundbreaking marketing strategy that changed how mathematical products reached mainstream audiences.

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Texas Instruments' educational partnership program that placed calculators directly in classrooms for free trials
Casio's celebrity mathematician endorsement campaign featuring Fields Medal winners
HP's 'Math Olympics' sponsorship that showcased calculator competitions on national television
Sharp's 'Solve It To Win It' sweepstakes requiring solutions to complex equations using their calculators