Which e-commerce platform first introduced adaptive learning algorithms for mathematics that dynamically adjusted problem difficulty based on student performance?

The digital age has transformed mathematics education through innovative e-commerce platforms. These platforms have democratized access to high-quality math resources, connecting students with tutors, interactive tools, and curriculum materials. But do you know which platform made the biggest splash in the mathematics learning marketplace? Test your knowledge about the intersection of e-commerce and mathematics education in this challenging trivia question!

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Khan Academy Marketplace (2009)
ALEKS by McGraw-Hill (2001)
Coursera's MathTrack (2012)
Wolfram Alpha Pro (2007)