Which gaming platform first introduced a fully digital storefront that allowed users to purchase and download full games directly to their console?

The gaming industry has transformed dramatically in how games are sold and distributed. From physical cartridges and discs to digital downloads and subscription services, the retail landscape for games has evolved significantly. This poll tests your knowledge of a pivotal moment in gaming retail history that changed how games are sold forever.

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Xbox 360 with Xbox Live Marketplace (2005)
PlayStation 3 with PlayStation Store (2006)
Nintendo Wii with Wii Shop Channel (2006)
Valve's Steam platform for PC (2003)