Which entrepreneur is credited with inventing the world's first true self-service grocery store in 1916, revolutionizing retail with a format that became the foundation for modern supermarkets?

The retail landscape was forever changed with the invention of self-service shopping. Before this innovation, customers would give their shopping lists to clerks who would gather items for them. One visionary entrepreneur created a revolutionary new store format that allowed customers to select their own merchandise - a concept that would transform retail forever and serve as the foundation for modern supermarkets and convenience stores worldwide.

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Clarence Saunders (Piggly Wiggly)
Frank Woolworth (F.W. Woolworth Company)
Sebastian Spering Kresge (S.S. Kresge Company/Kmart)
George Huntington Hartford (A&P)