Q:Information:  - Left 4 Dead is a cooperative first-person shooter video game with survival horror elements, developed by Valve South and published by Valve Corporation. The game uses Valve's proprietary Source engine, and is available for Microsoft Windows, Xbox 360 and OS X. Development on the game was completed on November 13, 2008, and two versions were released digitally: A downloadable digital version, released on November 17, 2008, and a digital retail disc version, with a release date determined by region. The digital retail disc version was released in North America and Australia on November 18, 2008; and in Europe on November 21, 2008.  - Half-Life 2 (stylized as HLF-LIFE) is a first-person shooter video game developed and published by Valve Corporation. The sequel to 1998's "Half-Life", it was released in November 2004, following a five-year, $40 million development phase, during which a substantial part of the project was leaked and distributed on the Internet. The game was developed alongside Valve's Steam software and the Source engine.  - Minerva ( stylized as MINERVA ) is an episodic series of single - player modifications ( `` mods '' ) for Valve Corporation 's Half - Life 2 . The mod was created by Adam Foster . Installments are released as each is finalized : the three releases for the Metastasis chapter have already been made , with the third installment released on October 1 , 2007 . The plot and settings of Minerva are linked to Someplace Else , Foster 's original map for Half - Life , and to Half - Life 2 itself . The mod was released on Steam on April 30 , 2013 .  - Valve Corporation (commonly referred to as Valve) is an American video game developer and digital distribution company headquartered in Bellevue, Washington. The company is known for the "Half-Life", "Counter-Strike", "Portal", "Day of Defeat", "Team Fortress", and "Left 4 Dead" series, "Dota 2", and its software distribution platform Steam.  - Digital distribution (also called content delivery, online distribution, or electronic software distribution (ESD), among others) is the delivery or distribution of media content such as audio, video, software and video games. The term is generally used to describe distribution over an online delivery medium, such as the Internet, thus bypassing physical distribution methods, such as paper, compact discs, and VHS videocassettes. The term online distribution is typically applied to freestanding products; downloadable add-ons for other products are more commonly known as downloadable content. With the advancement of network bandwidth capabilities, online distribution became prominent in the 21st century.    Given the information above, choose from the list below the object entity that exhibits the relation 'platform' with the subject 'minerva '.  Choices: - internet  - microsoft windows  - steam  - windows  - xbox
A:
microsoft windows