Which payment innovation did IBM introduce in 1973 that revolutionized retail by allowing electronic payment processing at point-of-sale?

The evolution of payment systems has dramatically transformed the retail landscape over decades. From cash registers to contactless payments, these innovations have shaped how businesses operate and consumers shop. This poll tests your knowledge about a pivotal moment in retail payment history that changed commerce forever. Can you identify the correct milestone that revolutionized transaction processing?

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Universal Product Code (UPC) barcode scanning system
The first magnetic stripe credit card reader
Electronic Funds Transfer Point-of-Sale (EFTPOS) system
The first touchscreen payment terminal