Which retail technology invention, patented in 1951 by Norman Joseph Woodland and Bernard Silver, revolutionized inventory management and is considered one of the most significant retail innovations of the 20th century?

The retail landscape has been shaped by numerous technological innovations throughout history. Some discoveries have completely revolutionized how consumers shop and how retailers operate. This trivia question focuses on a pivotal invention that dramatically altered the retail industry's trajectory and set the foundation for modern shopping experiences. Test your knowledge about this significant retail technology breakthrough that changed commerce forever!

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The barcode (Universal Product Code)
The electronic cash register (ECR)
The shopping cart with folding basket
The magnetic stripe card reader