Which innovative marketing strategy helped Texas Instruments dominate the educational calculator market in mathematics education during the 1990s?

In the competitive world of mathematics education publishing, companies have employed various marketing strategies to gain market share. One particular strategy revolutionized how math textbooks were sold to schools and universities in the early 2000s. Test your knowledge of this significant shift in mathematics education product marketing!

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Creating teacher workshops that provided free calculators and curriculum materials designed specifically for their graphing calculators
Offering significant student discounts through a mail-in rebate program that competitors couldn't match
Establishing exclusive partnerships with major textbook publishers to feature only TI calculators in examples
Launching a subscription-based calculator service where students rented devices for the academic year