Which e-commerce innovation first allowed language learning software to transition from physical CDs to direct digital downloads, revolutionizing the linguistics product market in the early 2000s?

The rise of e-commerce has dramatically transformed how language learning products are marketed and sold worldwide. From traditional dictionaries and textbooks to AI-powered language learning platforms, the retail landscape for linguistic products has undergone remarkable changes. This trivia question focuses on a key milestone in the evolution of language learning retail that changed how consumers access these educational tools.

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Rosetta Stone's Digital Download Platform (2001)
Amazon's Kindle Language Store (2007)
Apple's iTunes Language Education Section (2004)
Berlitz Digital Marketplace (2003)