Which retail technology advancement first allowed mathematics textbook publishers to implement 'adaptive learning paths' based on student performance data?

In the world of educational products, mathematics tools and textbooks represent a significant market segment. The way these products are marketed has evolved dramatically with technology. This poll explores a landmark retail technology advancement that revolutionized how mathematical educational products are marketed and sold, combining data analytics with personalized recommendations.

This is a live public trivia poll on AIPolls.Net. Vote and see real-time results.

Learning Analytics Platforms (2012)
AR-based formula visualization tools (2015)
Mathematical problem databases (2008)
Digital whiteboard integration systems (2010)