Which subscription model innovation first introduced adaptive learning algorithms for mathematics that adjust difficulty based on individual student performance?

Mathematics education has undergone significant transformations in how learning resources are delivered to students. Over the past decade, subscription-based learning platforms have revolutionized how mathematical concepts are taught and learned. These platforms use sophisticated algorithms and data analysis to personalize learning experiences. This poll tests your knowledge about a pivotal moment in mathematics education subscription services that changed the industry landscape.

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Khan Academy Premium (2014)
ALEKS by McGraw-Hill (2001)
Brilliant.org's Mathematics Pathway (2012)
Wolfram Alpha Pro (2009)