Which early point of sale system is considered the first successful commercial use of barcode scanning technology in retail history?

The way we process transactions in retail has dramatically evolved over the centuries. From manual ledgers to sophisticated computerized systems, point of sale technology represents one of the most significant transformations in retail history. This trivia question examines a pivotal moment in the development of modern retail checkout technology that forever changed how businesses process transactions and track inventory.

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IBM's 3660 Supermarket System (1973)
NCR's Class 5 Electronic Cash Register (1968)
Sweda's Model 800 Optical Scanner (1975)
Fujitsu's Electronic Transaction Terminal (1971)