Which technological advancement is widely credited with transforming e-commerce personalization from simple rule-based recommendations to sophisticated predictive systems?

In today's competitive digital retail landscape, e-commerce platforms have evolved significantly in how they approach customer personalization. This trivia question explores a key technological advancement that revolutionized how online retailers understand and predict consumer behavior. Test your knowledge about the technological turning point that enabled truly sophisticated personalization in e-commerce!

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Collaborative filtering algorithms that analyze purchase patterns across similar customer segments
Deep learning neural networks capable of processing unstructured data like browsing behavior and image preferences
A/B testing frameworks that automatically optimize product placement based on conversion rates
Cookie-based tracking systems that follow customers across multiple shopping sessions