Which invention, first implemented in e-commerce in 1994, is credited with making online shopping viable by addressing consumer security concerns?

In the ever-evolving landscape of retail, certain technological innovations have completely transformed how consumers shop online. One particular invention revolutionized e-commerce by addressing a major consumer concern that had previously limited online shopping growth. Test your knowledge of retail history and the pivotal discoveries that shaped today's digital marketplace!

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SSL (Secure Sockets Layer) encryption for secure transactions
One-click purchasing patents
Digital shopping carts
Customer recommendation algorithms