Which e-commerce platform first introduced adaptive learning algorithms for mathematics that personalized product recommendations based on a student's skill level?

The intersection of mathematics and e-commerce has created powerful platforms that revolutionized how educational products are sold and distributed. Advanced algorithms, recommendation systems, and personalized learning paths have transformed the landscape of mathematical education resources. This poll tests your knowledge about a significant innovation in the math education market that changed how students access learning materials.

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Descartes Learning Exchange (founded 2011)
MathBlox (founded 2008)
Knewton Adaptive Learning Platform (founded 2008)
Euler's Digital Marketplace (founded 2013)