Which pioneering technology, introduced in the 1990s, is widely credited as the first major retail personalization system that used collaborative filtering to recommend products to customers?

The history of retail personalization technology has transformed how we shop and how retailers connect with consumers. Before algorithms recommended products based on your browsing history or apps showed you personalized offers, there were pioneering technologies that laid the groundwork for today's hyper-personalized shopping experiences. Test your knowledge about a significant milestone in the evolution of retail personalization!

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Amazon's item-to-item collaborative filtering system
Walmart's Smart Shopping Assistant
IBM's ShopperTrak Analytics
Apple's iBeacon proximity marketing system