Which retail technology innovation, first used commercially in 1974, fundamentally transformed inventory tracking and is considered one of the most significant retail advancements of the 20th century?

The history of retail is marked by pivotal technological innovations that transformed how consumers shop and how businesses operate. One particularly significant advancement in the mid-20th century revolutionized inventory management and checkout processes worldwide, leading to dramatic efficiency improvements and setting the stage for modern retail operations. This innovation remains fundamental to retail operations even in today's digital commerce landscape.

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Electronic Cash Register (ECR)
Universal Product Code (UPC) barcode system
Electronic Data Interchange (EDI)
Point of Sale (POS) credit card terminal