Which innovative marketing strategy transformed the mathematics textbook industry in the early 2000s, leading to a 40% increase in adoption rates at universities?

In the highly competitive world of mathematics textbooks, publishers employ various marketing strategies to stand out. One particular marketing approach revolutionized how math textbooks were sold to universities and became the gold standard in the industry. This poll tests your knowledge of product marketing innovations specifically within the mathematics education sector.

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The 'Solution Manual Access Code' model, where students had to purchase separate online access to view worked solutions
The 'Interactive Theorem' approach, featuring augmented reality demonstrations of mathematical concepts
The 'Mathematics Celebrity' endorsement program, with famous mathematicians promoting specific textbooks
The 'Customized Campus Edition' strategy, where textbooks were tailored with university-specific branding and examples