Which early retail technology innovation is widely credited as the first commercially successful electronic point of sale system, revolutionizing retail in the 1970s?

The modern retail experience has evolved dramatically over the centuries, from manual recordkeeping to sophisticated digital systems. Point of Sale (POS) technology represents one of the most transformative innovations in retail history, fundamentally changing how merchants track inventory, process transactions, and analyze consumer behavior. This trivia question explores a pivotal moment in retail technology history that set the foundation for today's advanced POS systems.

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IBM's 3660 Supermarket System (1973)
NCR's 280 Electronic Cash Register (1969)
McDonald's MICROS System (1974)
Sears' Automated Checkout Terminal (1971)