Which major retail payment innovation was first demonstrated at a Diner's Club dinner in 1950, leading to what we now recognize as modern credit cards?

The way we pay for goods has evolved dramatically over the decades. From cash transactions to contactless payments, retail payment systems have revolutionized commerce. One particular innovation changed the retail landscape forever, creating convenience but also raising new security challenges. Test your knowledge about this pivotal moment in payment technology history!

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The cardboard Diner's Club card (the first multipurpose charge card)
The magnetic stripe system (allowing electronic data reading)
The embedded microchip payment method (EMV technology)
The carbon-copy imprinter (the 'knuckle-buster')