Which e-commerce platform pioneered the widespread use of the 'marketplace model' allowing third-party sellers to list alongside the platform's own inventory?

Test your knowledge about the history and development of major e-commerce platforms! The e-commerce landscape has evolved dramatically over the past three decades, with various platforms rising and falling in prominence. This trivia question focuses on a pivotal moment in e-commerce history that shaped how online retail operates today.

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Amazon (starting with 'Amazon Marketplace' in 2000)
eBay (with its 'Buy It Now' feature in 1997)
Alibaba (with Taobao in 2003)
Rakuten (formerly Buy.com, in 2002)