Which historic innovation is considered the first modern point of sale system that revolutionized retail in the late 19th century?

Before computerized registers and digital transactions dominated retail, point of sale systems evolved through fascinating technological breakthroughs. This trivia question explores a pivotal moment in retail history that forever changed how businesses process transactions and track inventory. Test your knowledge of the technological milestones that built today's retail infrastructure!

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The Ritty 'Incorruptible Cashier' mechanical cash register (1879)
IBM's punch-card inventory system (1896)
Singer's mechanical sales tracking device (1883)
Western Union's telegraph-based transaction network (1871)