Which historical innovation is considered the first true electronic point-of-sale (POS) system that revolutionized retail checkout processes?

Before computerized checkouts and digital payments transformed retail, point of sale systems underwent a fascinating evolution that shaped modern commerce. From mechanical cash registers to today's sophisticated POS terminals, these systems have dramatically changed how businesses operate. This trivia question explores a pivotal moment in retail technology history that set the foundation for today's shopping experience.

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IBM's 3660 Supermarket System (1973)
NCR's Class 5 mechanical cash register (1884)
The Sweda electronic register (1965)
McDonald's Computerized Ordering System (1968)