Which pioneering technology first enabled mass retail personalization, launching the era of tailored shopping experiences in the early 2000s?

In the ever-evolving world of retail, personalization technologies have transformed how businesses connect with consumers. From basic recommendation systems to sophisticated AI-driven experiences, retailers have found increasingly powerful ways to tailor shopping experiences to individual preferences. But do you know when the retail personalization revolution truly began? Test your knowledge about this pivotal innovation that changed shopping forever.

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Collaborative filtering algorithms introduced by Amazon's recommendation system
RFID tracking tags in physical retail stores
Facebook's Custom Audiences advertising platform
NFC-enabled mobile payment systems