Which retail giant first introduced and widely implemented handheld scan-and-go technology allowing customers to scan items while shopping in 2011?

Self-checkout and scan-and-go technologies have transformed the retail landscape, creating more autonomous shopping experiences and changing staffing models in stores worldwide. This technology has evolved rapidly over the past decades, but do you know where it all began? Test your knowledge about the pioneering moments in retail technology that set the stage for today's frictionless shopping experiences.

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Walmart
Sam's Club
Target
Amazon