In which decade was the modern barcode (UPC) first commercially used in retail stores, revolutionizing inventory management and checkout processes?

Throughout history, certain product innovations have revolutionized entire industries and changed how people live. These breakthrough products often emerged from addressing specific historical needs or technological limitations of their era. This trivia question challenges you to identify when a particularly transformative product innovation first appeared on the consumer market, forever changing shopping habits and commercial distribution.

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1950s - During post-war economic boom
1970s - After development by IBM and adoption by grocery industry
1960s - Alongside early computerized inventory systems
1980s - When scanner technology became affordable for widespread retail use