Which historical retail innovation from the 1950s is considered the precursor to modern customer analytics, allowing retailers to track purchasing patterns for the first time?

Before today's sophisticated retail analytics systems, the foundations of data-driven retail decision making were being laid during key historical periods. This trivia explores a pivotal moment in retail analytics history that transformed how merchants understood customer behavior and led to practices we now take for granted in modern retail strategy.

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The introduction of punch card inventory systems at Sears
The development of the UPC barcode scanning system
The creation of the Diners Club card, the first universal credit card
The implementation of IBM's first electronic cash registers