Which brand strategy innovation by Springer Mathematics in the early 2000s revolutionized how mathematical textbooks were marketed to universities?

The mathematical publishing industry has evolved significantly over the decades, with publishers adopting various brand strategies to differentiate themselves in the academic market. This trivia tests your knowledge about a pivotal brand strategy move that transformed how mathematical textbooks are marketed and distributed to universities and research institutions. Do you know which strategic innovation changed the landscape of mathematical publishing?

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The 'Yellow Series' branding that color-coded textbooks by mathematical sub-discipline
The MathSelect platform, allowing customized textbook compilation from multiple sources
The 'Proof Partners' program that connected authors directly with university departments
The Mathematical Visualization Initiative that bundled software with traditional textbooks