Which invention, first used commercially in a grocery store in 1974, revolutionized retail by enabling automated checkout and inventory tracking?

In the world of retail and commerce, certain inventions have transformed how we shop and how products reach consumers. This trivia question focuses on one of the most revolutionary retail inventions of the 20th century that fundamentally changed supply chain management, inventory control, and the customer checkout experience. Test your knowledge of retail technology history!

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• The Universal Product Code (UPC) barcode
• The electronic cash register (ECR)
• The credit card magnetic stripe
• The automatic door sensor

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