Which invention, first demonstrated in 1973 and commercially implemented by IBM, revolutionized retail payment systems by allowing electronic fund transfers at point of sale?

The way we pay for products has evolved dramatically over decades. From cash-only transactions to contactless payments, retail payment innovations have revolutionized the shopping experience. This poll explores a critical invention that transformed retail payment systems and laid the groundwork for modern digital commerce. Test your knowledge about this pivotal technological breakthrough!

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Universal Product Code (UPC) barcode scanner
Electronic Data Interchange (EDI) protocol
Magnetic stripe card reader technology
Digital point-of-sale (POS) receipt printer