Which of these revolutionary retail inventions was first patented by David Brown and Bernard Silver at Drexel University in 1952, forever changing how products are tracked and sold?

The retail landscape has been shaped by numerous groundbreaking inventions and discoveries. From simple tools that transformed how products are sold to technological innovations that revolutionized the shopping experience, these inventions have had profound impacts on consumer behavior and retail operations. This trivia question focuses on a pivotal invention that fundamentally changed retail operations worldwide and remains essential to this day.

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The UPC barcode scanning system
The electronic cash register (ECR)
The shopping cart with folding basket
The pneumatic tube cash delivery system