Which packaging innovation revolutionized college mathematics textbooks in the early 2000s, dramatically changing student purchasing behavior?

The mathematics education market has seen numerous innovations in how textbooks and learning materials are packaged and marketed to students and educators. One particular packaging innovation created a significant shift in how math textbooks were perceived and consumed by college students. This poll tests your knowledge of product development history in educational mathematics materials and how consumer psychology influenced a major change in the industry.

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Bundled solution manuals with tear-out practice exams
Loose-leaf binder formats that allowed students to purchase only needed chapters
Digital access codes with augmented reality problem demonstrations
Color-coded textbooks with embedded QR code video tutorials