Which invention, introduced in the 1970s, first allowed merchants to electronically verify and process credit card transactions in retail stores?

Retail payment systems have transformed how we shop, but do you know which groundbreaking invention first allowed merchants to process credit card transactions electronically? This innovation fundamentally changed retail by eliminating manual imprinting and revolutionized commerce by enabling real-time authorizations. Test your knowledge about this pivotal retail technology milestone that set the foundation for today's digital payment landscape.

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Electronic Data Interchange (EDI) system
Electronic Funds Transfer Point-of-Sale terminal
Magnetic Inventory Control System (MICS)
Digital Currency Authorization Protocol (DCAP)