What item is widely recognized as the first product ever sold on a secure online retail transaction?

E-commerce has transformed retail dramatically over the past few decades. While many people are familiar with today's giants like Amazon and Alibaba, the origins of online shopping have some fascinating historical details that even industry professionals might not know. Test your knowledge about a pivotal moment in e-commerce history!

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A book (The Net, by John Sumser)
A Sting CD (Ten Summoner's Tales)
A pizza (from Pizza Hut)
A computer part (Commodore 64 memory expansion)