What product was sold in the world's first secure e-commerce transaction in 1994?

Before Amazon and eBay dominated online shopping, there were early pioneers who laid the groundwork for e-commerce as we know it today. This trivia question explores a significant milestone in the evolution of online retail - the very first secure e-commerce transaction. Test your knowledge about this pivotal moment that helped transform how we shop and do business in the digital age.

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A music CD (Sting's 'Ten Summoner's Tales')
A computer software program (Microsoft Windows)
A book (Neal Stephenson's 'Snow Crash')
A pizza (from Pizza Hut)