Which gaming retail technology innovation first introduced the concept of 'microtransactions' that fundamentally changed the gaming industry's revenue model?

The gaming industry has pioneered innovative retail technologies that transformed how players discover, purchase, and experience games. From digital distribution platforms to immersive in-store experiences, gaming retailers have continuously evolved their technological approaches. This trivia challenges your knowledge about a pivotal retail technology moment that changed how we buy and access games forever.

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Valve's Steam platform with its 2010 Team Fortress 2 'Mann-conomy Update'
Microsoft's Xbox Live Marketplace with its 2005 'Horse Armor' DLC for The Elder Scrolls IV: Oblivion
Electronic Arts' 'Project Ten Dollar' online pass system introduced in 2010
Sony's PlayStation Network Store with its 2008 'LittleBigPlanet' costume DLCs