Which retail innovation of the 1950s is widely considered the first major application of formal customer segmentation in modern retail history?

The history of retail marketing has seen dramatic transformations over the decades. Before sophisticated algorithms and big data, retailers had to find creative ways to segment their markets and target specific customer groups. This trivia question explores a pivotal moment in retail history when customer segmentation strategies began to fundamentally change how businesses approached their markets. Test your knowledge about this retail marketing milestone!

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The introduction of PRIZM (Potential Rating Index for Zip Markets) neighborhood classification system
The development of the Diners Club card, the first universal credit card, allowing retailers to track and categorize spending patterns
Sears Roebuck's regional catalog variations based on geographic purchasing patterns
A.C. Nielsen's retail store audit system for tracking product movements by customer types