Information: - Ragnarok Online (spelled Ragnarok in the logo alternatively subtitled The Final Destiny of the Gods), often referred to as "RO", is a Korean massive multiplayer online role-playing game or MMORPG created by GRAVITY Co., Ltd. based on the manhwa "Ragnarok" by Lee Myung-jin. It was first released in South Korea on 31 August 2002 for Microsoft Windows and has since been released in many other locales around the world. The game has spawned an animated series, "Ragnarok the Animation", and a sequel game, "". Player characters exist in a world with a player environment that gradually changes with the passage of time. Major changes in the features and history of the world take place as episodes in the RO timeline. Player characters interact in a 3D environment but are represented by 2D character sprites for front, back, side and diagonal facings. The major types of server-supported gameplay are Player vs Environment, Guild vs Guild, Player vs Player. Also supported by the game server are Group vs Group, Arena Combat, Player vs Monster, Player vs All, and various other specific scenarios at designated instance locations in the game world. NPC-run challenges and contests are also available with prizes, awards, and/or in a specific hall of fame listing. - Free-to-play (F2P) refers to video games which give players access to a significant portion of their content without paying. There are several kinds of free-to-play games, but the most common is based on the freemium software model. For freemium games, users are granted access to a fully functional game, but must pay microtransactions to access additional content. Free-to-play can be contrasted with pay to play, in which payment is required before using a service for the first time. - Freemium is a pricing strategy by which a product or service (typically a digital offering or application such as software, media, games or web services) is provided free of charge, but money (premium) is charged for proprietary features, functionality, or virtual goods. Origin. The business model called shareware has been in use for software (crippleware or freeware) since the 1980s, particularly in the form of a free time- or feature-limited ("lite") version, often given away on a floppy disk or CD-ROM, to promote a paid-for full version. The model is particularly suited to software as the cost of distribution is negligible, so little is lost by giving it away for free as long as significant cannibalization is avoided. - Founded in March 2003, Gravity Interactive LLC was created to host games for North America developed by GRAVITY Co., Ltd.. It is based in Buena Park near Orange County, California. Gravity was initially provided with several servers from Gravity Co., and began beta testing of the International Ragnarok Online (iRO) service in 2003. Commercial service subsequently began on June 1, 2003. In 2005, Gravity also began hosting the North American version of ROSE Online (naROSE). On January 1, 2006, Gravity Interactive LLC became Gravity Interactive, Inc. In February 2008, Gravity began beta testing its third MMORPG, . Around mid to late 2012 Gravity began beta testing its fourth MMORPG, Maestia: Rise Of Keledus. In April 2013, Gravity began beta testing the second title in the Ragnarok Online series. was launched in May 2013 and also available on Steam. - ROSE Online , or Rush On Seven Episodes Online ( Korean : ) is a Massively Multiplayer Online Roleplaying Game ( MMORPG ) previously published by Korean company Gravity Corporation and developed by its subsidiary , Triggersoft . The game was originally pay to play , but Triggersoft stopped developing the game in 2007 , and the rights of ROSE Online were sold to several different companies which now develop and publish their own free - to - play versions of the game . Gravity Interactive develops and publishes a version of the game known as naROSE for 3 North American and 40 European countries . - Microtransaction is a business model where users can purchase virtual goods via micropayments. Microtransactions are often used in free-to-play games to provide a revenue source for the developers. While microtransactions are a staple of the mobile app market, they are also available on traditional computer platforms such as Valve's Steam platform. After reading the paragraphs above, we are interested in knowing the entity with which 'rose online' exhibits the relationship of 'platform'. Find the answer from the choices below. Choices: - microsoft windows - steam - web
A:
microsoft windows