Which strategic rebrand decision helped Valve transform from a game developer to a dominant digital distribution platform in the gaming industry?

Test your knowledge of pivotal brand strategy decisions in the gaming industry! Many successful gaming companies have made bold strategic moves that transformed their market position. This question focuses on a famous gaming company's strategic pivot that completely changed their trajectory and industry standing. Do you know your gaming history well enough to identify the correct strategic move?

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The acquisition of Blizzard Entertainment to expand their game portfolio
The creation of Steam as a platform for distributing and managing game updates
Their shift to mobile gaming with the release of the Valve Mobile App Store
The development of the Source 2 game engine exclusively for third-party developers