Which pioneering retail invention from the 1970s first enabled mass personalization of customer purchasing data, allowing retailers to track individual consumer habits?

The evolution of retail personalization has transformed how businesses connect with consumers. Before sophisticated algorithms and AI, there were groundbreaking innovations that paved the way for today's hyper-personalized shopping experiences. This poll tests your knowledge about a pivotal invention that revolutionized how retailers could track and analyze customer preferences—fundamentally changing the relationship between businesses and consumers forever.

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Universal Product Code (UPC) barcode system
Electronic customer loyalty card
Digital point-of-sale (POS) terminal
Customer Relationship Management (CRM) software