Which game is widely credited with popularizing microtransactions in Western markets, introducing the 'horse armor' DLC that became a turning point in gaming monetization strategies?

In the world of gaming, monetization strategies have evolved dramatically over the years. One of the most transformative approaches has been microtransactions - small purchases that unlock cosmetics, features, or advantages within games. This model has revolutionized gaming economics, especially in free-to-play titles. Test your knowledge about the origins of this pricing strategy that has shaped modern gaming business models and consumer behavior!

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The Elder Scrolls IV: Oblivion (2006)
World of Warcraft (2004)
Team Fortress 2 (2007)
MapleStory (2003)