Which architectural innovation is credited with pioneering the modern 'big box' retail format that revolutionized store layouts in the 1960s?

The architectural design of retail spaces has evolved dramatically over decades, with significant innovations in store layouts transforming customer experiences and business operations. This poll tests your knowledge about a pivotal development in retail architecture that changed how buildings were designed for commercial purposes, influencing everything from urban planning to consumer behavior.

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Walmart's Supercenter design with its characteristic wide aisles and high ceilings
Kmart's K-Mart Plaza concept with attached garden centers
The Southdale Center in Minnesota, the first fully enclosed, climate-controlled shopping mall
The original Meijer Thrifty Acres in Grand Rapids, Michigan, which combined grocery and department store under one roof