Which innovative marketing strategy did Texas Instruments use in the 1990s that helped their graphing calculators become the standard in mathematics classrooms?

Texas Instruments revolutionized mathematics education with their graphing calculators, but they faced fierce competition in the educational technology market. This poll explores a pivotal marketing campaign that significantly boosted TI's dominance in the classroom. Test your knowledge about how product marketing strategies shaped the landscape of mathematical education tools that millions of students use today.

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They created teacher workshops and provided free calculators to educators, turning them into brand advocates
They partnered with major textbook publishers to include problems specifically solvable with TI calculators
They launched a 'Calculator for Life' campaign, offering lifetime warranties on all educational models
They implemented a subscription model where schools received annual calculator upgrades at reduced prices