Which innovative marketing strategy revolutionized mathematics textbooks in the 1990s, leading to widespread adoption across universities?

Throughout history, mathematics textbooks have employed various marketing strategies to stand out in the educational market. From innovative visual designs to revolutionary teaching approaches, publishers have competed to create the most effective learning tools. This trivia question explores a significant marketing breakthrough in the mathematics education industry that changed how complex concepts are presented to students.

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The inclusion of real-world application sections showing how abstract concepts apply to engineering, finance, and computer science
The addition of celebrity mathematician endorsements and testimonials on textbook covers
The introduction of scented pages that released aromas to enhance memory retention during study sessions
The implementation of subscription-based textbook models with monthly mathematics problem updates