Which invention first enabled retailers to track individual customer purchases for data analysis?

The retail landscape has been transformed by numerous technological innovations throughout history. These breakthroughs have revolutionized how consumers shop and how retailers analyze customer behavior. This poll tests your knowledge about a significant invention that changed the face of retail analytics and shopping patterns worldwide. Do you know which groundbreaking technology first allowed retailers to systematically track individual purchases?

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Universal Product Code (UPC) barcode scanning system (1974)
Electronic cash registers (1950s)
Magnetic stripe cards (1960s)
RFID inventory tracking (1983)