Which cryptographic protocol, invented in the mid-1990s, revolutionized e-commerce by enabling secure transactions and is still fundamental to online shopping today?

E-commerce has transformed how we shop and conduct business online. Behind today's seamless digital shopping experiences are numerous technological breakthroughs and innovative solutions. This trivia question explores a significant milestone in e-commerce history that fundamentally changed online retail security. Test your knowledge about the inventions that made modern digital commerce possible!

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Secure Sockets Layer (SSL)
Hypertext Transfer Protocol (HTTP)
File Transfer Protocol (FTP)
Simple Mail Transfer Protocol (SMTP)