What innovative retail strategy did Texas Instruments use in the 1990s that helped its graphing calculators become the standard in mathematics education?

Texas Instruments revolutionized mathematics education with their graphing calculators, becoming fixtures in classrooms worldwide. This poll explores an interesting aspect of their product marketing strategy that helped solidify their dominance in the educational mathematics tool market. Test your knowledge about how this iconic brand positioned itself in the competitive world of mathematical tools!

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Creating specialized teacher workshops that trained educators on TI calculators exclusively
Offering significant student discounts through a mail-in rebate program
Bundling calculators with popular mathematics textbooks at no additional cost
Implementing a buy-back program where schools could trade old calculators for new models