Which retail technology innovation from the 1970s revolutionized checkout processes by introducing the first widespread use of machine-readable product identification?

Before digital scanners and touchscreens dominated checkout counters, retail technology evolved through fascinating stages that shaped shopping experiences throughout history. This trivia question explores a pivotal moment in retail technology that transformed how stores tracked inventory and processed transactions. Test your knowledge about this revolutionary retail innovation that bridged mechanical cash registers and modern computerized systems.

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Universal Product Code (UPC) barcode scanning
Electronic Funds Transfer at Point of Sale (EFTPOS) terminals
NCR's Class 5 mechanical cash register with receipt printing
IBM's punch card inventory management system