Which innovative retail market segmentation strategy first revolutionized college-level mathematics textbook sales in the early 2000s?

The educational publishing industry has undergone significant transformations in how mathematics textbooks are marketed and sold. Publishers have employed various innovative strategies to segment their market, enhance customer loyalty, and create distinctive experiences for educators and students alike. This poll tests your knowledge about a groundbreaking marketing approach that revolutionized mathematics textbook sales.

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Interactive digital supplements with personalized practice problems based on individual student performance data
Celebrity mathematician endorsements featuring Fields Medal winners as brand ambassadors
Modular textbook pricing allowing students to purchase only chapters required for their specific course
Subscription-based access with integrated AI tutoring systems for homework assistance