Which company invented and installed the world's first commercial self-checkout system in a retail store?

Self-checkout technology revolutionized the retail experience by allowing customers to scan and pay for their purchases without cashier assistance. This innovation has dramatically changed store layouts, customer behavior, and retail employment patterns since its introduction. How well do you know the history of this game-changing retail technology?

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IBM (International Business Machines)
NCR Corporation (formerly National Cash Register)
Fujitsu
Walmart's internal R&D department