Which groundbreaking invention is considered the first modern electronic Point of Sale (POS) system that revolutionized retail transactions?

Point of Sale (POS) systems have transformed how retailers conduct business, evolving from simple cash registers to sophisticated technology hubs. These innovations have dramatically changed inventory management, customer tracking, and payment processing across the retail landscape. This trivia question explores a pivotal moment in retail technology history that fundamentally changed how businesses operate worldwide.

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IBM's 3660 Supermarket System (1973)
NCR's Model 2552 Electronic Cash Register (1968)
Burroughs' B-90 Retail Terminal (1975)
Digital Equipment Corporation's PDT-11 (1971)