Which invention, first used commercially in 1974 at an Ohio supermarket, revolutionized retail pricing by allowing automated price lookup at checkout?

In the world of retail innovations, certain inventions have fundamentally transformed how products are priced and sold. This trivia question explores a groundbreaking pricing technology that revolutionized checkout efficiency and pricing accuracy worldwide. Test your knowledge about this pivotal invention that bridged the gap between product identification and pricing strategies, forever changing the retail landscape and enabling sophisticated data analytics that we now take for granted.

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Universal Product Code (UPC) barcode system
Electronic Shelf Labels (ESL)
Radio-Frequency Identification (RFID) tags
NCR Class 5 mechanical cash register