Which groundbreaking retail invention was first used commercially in 1974 on a pack of Wrigley's gum, eventually leading to massive improvements in checkout efficiency and inventory tracking?

The world of retail has been transformed by numerous technological innovations throughout history. One particular invention revolutionized how products are identified and tracked, dramatically speeding up checkout times and inventory management. This innovation represents one of the most significant retail transformations of the 20th century, fundamentally changing how businesses operate. Test your knowledge of this landmark retail technology!

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RFID (Radio-Frequency Identification) tags
UPC barcode
LCD price display
Electronic Point of Sale (EPOS) system