Which retail technology innovation first allowed console gamers to download full games directly to their systems rather than requiring physical discs?

The gaming industry's retail landscape has transformed dramatically in recent years. From physical stores to digital marketplaces, the way gamers purchase their favorite titles has evolved with technology. This poll tests your knowledge about a significant retail technology shift that changed how gamers access their content. Do you know which innovation revolutionized game distribution and retail in the modern era?

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Steam's digital distribution platform (2003)
Xbox Live Marketplace's 'Xbox Originals' program (2007)
PlayStation Store's PS1 Classics (2006)
Nintendo's Virtual Console service (2006)