Which retail innovation, first introduced in 1916, fundamentally transformed shopping by allowing customers to select their own merchandise without clerk assistance?

The retail landscape has transformed dramatically throughout history. Long before online shopping and contactless payments, innovations in physical retail spaces fundamentally changed how people shopped and interacted with products. This trivia question focuses on a pivotal retail innovation that revolutionized consumer behavior and set the foundation for modern shopping experiences. Test your knowledge about this historic retail breakthrough!

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Self-service grocery store (Piggly Wiggly)
Department store with multiple sections (Macy's)
Mail-order catalog shopping (Sears Roebuck)
Mechanical cash register system (NCR)