Which gaming company first introduced the controversial 'horse armor' DLC in 2006, widely considered the beginning of modern microtransactions in mainstream gaming?

Test your knowledge about the history of in-game purchases and virtual economies! The gaming industry has revolutionized digital commerce through innovative marketplace designs and purchasing systems. From early DLC to modern microtransactions, virtual economies have become a cornerstone of gaming business models. This question explores a pivotal moment in how game developers monetized their virtual worlds and forever changed consumer behavior in digital spaces.

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Bethesda (The Elder Scrolls IV: Oblivion)
Electronic Arts (The Sims 2)
Blizzard Entertainment (World of Warcraft)
Valve Corporation (Half-Life 2)