Which retail technology innovation first allowed products to be automatically identified at checkout without manual price entry?

The way we pay for goods in retail stores has evolved dramatically over the decades. From manual cash registers to today's contactless payment methods, checkout technology represents one of the most visible aspects of retail innovation. This trivia question tests your knowledge about a significant technological advancement that changed how retailers process transactions and manage inventory simultaneously.

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RFID (Radio-Frequency Identification) tags
UPC barcodes and optical scanners
NFC (Near-Field Communication) payment terminals
Electronic cash registers with digital displays