Information:  - San Diego (Spanish for "Saint Didacus") is a major city in California, United States. It is in San Diego County, on the coast of the Pacific Ocean in Southern California, approximately south of Los Angeles and immediately adjacent to the border with Mexico.  - Activision Blizzard, Inc. is an American interactive gaming and entertainment company. Headquartered in Santa Monica, California and founded in 2008 through the merger of Vivendi Games and Activision, the company is traded on the NASDAQ stock exchange under the ticker symbol , and since 2015 has been one of the stocks that make up the S&P 500. Activision Blizzard currently includes five business units: Activision, Blizzard Entertainment, Major League Gaming, Activision Blizzard Studios, and King Digital Entertainment.  - Rockstar Games, Inc. (sometimes referred to as Rockstar NYC) is an American video game publisher, best known for their "Grand Theft Auto", "Red Dead", "Midnight Club", "Max Payne", "The Warriors", "Bully", and "Manhunt" games.  - Video game development is the process of creating a video game. Development is undertaken by a game developer, which may range from one person to a large business. Traditional commercial PC and console games are normally funded by a publisher and take several years to develop. Indie games can take less time and can be produced cheaply by individuals and small developers. The indie game industry has seen a rise in recent years with the growth of new online distribution systems and the mobile game market.  - Frog City Software was a video game developer which focused on strategy games , opened in 1995 . Frog City Software was a subsidiary of Take - Two Interactive until they closed it in 2006 . The company was founded by the brothers Bill Spieth and Ted Spieth and by Rachel Bernstein . In 2004 Frog City was bought by Gathering , which was itself bought by Take 2 Interactive in 2005 . Frog City was shut down in 2006 ; it was the fourth game development studio to be shut down by Take - Two Interactive during that year . In April of that year , veterans of Frog City including the founders Ted Spieth , Bill Spieth and Rachel Bernstein started a new game development studio called Sidecar Studios . In 2007 Sidecar Studios was closed . In 2007 Bernstein joined Electronic Arts as a Senior Producer .  - A video game developer is a software developer that specializes in video game development  the process and related disciplines of creating video games. A game developer can range from one person who undertakes all tasks to a large business with employee responsibilities split between individual disciplines, such as programming, design, art, testing, etc. Most game development companies have video game publisher financial and usually marketing support. Self-funded developers are known as independent or indie developers and usually make indie games.  - Bethesda Softworks LLC is an American video game publisher based in Rockville, Maryland. The company was founded by Christopher Weaver in 1986 in Bethesda, Maryland as a division of Media Technology Limited, and nowadays is a wholly owned subsidiary of ZeniMax Media. Originally a video game developer itself, Bethesda Softworks now acts as the publisher for their in-house development team, Bethesda Game Studios, and ZeniMax Media's subsidiaries, ZeniMax Online Studios, id Software, Arkane Studios, MachineGames, Tango Gameworks and BattleCry Studios.  - Novato is a city in northern Marin County, in the North Bay region of the San Francisco Bay Area, in the U.S. state of California. As of the 2010 United States Census, its population was 51,904. Novato is located about northwest of San Rafael and about north of San Francisco on U.S. 101.  - Vancouver, officially the City of Vancouver, is a coastal seaport city on the mainland of British Columbia, Canada, and the most populous city in the province.  - Toronto is the most populous city in Canada, the provincial capital of Ontario, and the centre of the Greater Toronto Area, the most populous metropolitan area in Canada. Growing in population, the 2011 census recorded a population of 2,615,060. As of 2015, the population is now estimated at 2,826,498, making Toronto the fourth-largest city in North America based on the population within its city limits. Toronto trails only Mexico City, New York City, and Los Angeles by this measure, while it is the fifth-largest (behind also Chicago) if ranked by the size of its metropolitan area . An established global city, Toronto is an international centre of business, finance, arts, and culture, and widely recognized as one of the most multicultural and cosmopolitan cities in the world.  - The City of New York, often called New York City or simply New York, is the most populous city in the United States. With an estimated 2015 population of 8,550,405 distributed over a land area of just , New York City is also the most densely populated major city in the United States. Located at the southern tip of the state of New York, the city is the center of the New York metropolitan area, one of the most populous urban agglomerations in the world. A global power city, New York City exerts a significant impact upon commerce, finance, media, art, fashion, research, technology, education, and entertainment, its fast pace defining the term "New York minute". Home to the headquarters of the United Nations, New York is an important center for international diplomacy and has been described as the cultural and financial capital of the world.  - Take-Two Interactive Software, Inc. (commonly referred to as Take-Two Interactive, abbreviated as Take2 or T2) is an American multinational publisher distributor of video games and video game peripherals. Take-Two wholly owns publishers Rockstar Games and 2K Games. The company's headquarters are in New York City, with international headquarters in Windsor, United Kingdom. Development studio locations include San Diego, Vancouver, Toronto and Novato, California. Notable game series published by Take-Two include "Grand Theft Auto", "Civilization", "NBA 2K", "BioShock" and "Borderlands". As owner of 2K Games, Take-Two publishes its 2K Sports titles. It also acted as the publisher of Bethesda Softworks's 2006 game, "". As of 2016, it is the third largest publicly-traded game company (after Activision Blizzard and EA) in North America    Given the paragraphs above, decide what entity has the relation 'headquarters location' with 'san francisco'.
The answer to this question is:
frog city software