Which marketing innovation by Texas Instruments in the 1990s revolutionized graphing calculator adoption in mathematics education?

Mathematics education products have undergone significant transformation in recent decades. From traditional textbooks to interactive digital platforms, the marketing strategies for math education tools have evolved to address changing classroom needs and learning approaches. This poll tests your knowledge about a groundbreaking marketing campaign that changed how mathematics products are promoted to educational institutions.

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The T-I-89 Exchange Program, allowing schools to trade old calculators for new models at 50% discount
The 'Teachers Teaching with Technology' (T³) program, training educators to integrate calculators into curriculum
The Calculator Classroom Challenge, giving free calculators to schools with highest improvement in math scores
The Graphing Games Competition, sponsoring nationwide math tournaments with calculator prizes