Which retail technology innovation from the early 20th century is considered the precursor to modern self-service shopping and supermarkets?

Throughout history, retail technology has evolved dramatically, transforming how we shop. From manual cash registers to sophisticated AI systems, these innovations have shaped consumer experiences across generations. This trivia question challenges your knowledge about a pivotal moment in retail technology history that changed shopping forever. Do you know when this retail revolution began?

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Piggly Wiggly's self-service store model (1916)
The Sears Catalog telephone ordering system (1908)
NCR's electric cash register system (1906)
Marshall Field's escalator shopping experience (1912)