Which retail innovation is credited as the first true 'self-service' grocery store, allowing customers to select their own items without clerk assistance?

The retail landscape was forever changed when customers were first empowered to select their own products without clerk assistance. This innovation fundamentally transformed shopping experiences and laid the groundwork for modern retail as we know it today. Test your knowledge about this pivotal retail innovation that changed consumer behavior and store design forever!

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Piggly Wiggly (founded 1916)
A&P Economy Stores (founded 1912)
King Kullen (founded 1930)
Safeway (founded 1915)