Question: What California county contains the city where Malfador Machinations is headquartered?

full_context: Document 1: Malfador Machinations: Malfador Machinations is a small game company based in Santa Rosa, California. They are best known for their "Space Empires" series.
Document 2: Master of Orion: "Master of Orion" is a significantly expanded and refined version of the prototype/predecessor game "Star Lords" (not to be confused with "Starlord", also released by MicroProse in 1993). Steve Barcia's game development company Simtex demonstrated "Star Lords" to MicroProse and gaming journalist Alan Emrich who, along with Tom Hughes, assisted Barcia in refining the design to produce "Master of Orion"; and the game's manual thanks them for their contributions. Emrich and Hughes later wrote the strategy guide for the finished product. MicroProse published the final version of the game in 1994.
Document 3: Santa Rosa, California: Santa Rosa is a city in and the county seat of Sonoma County, California, United States. Its estimated 2014 population was 174,170. Santa Rosa is the largest city in California's Redwood Empire, Wine Country and the North Bay; the fifth most populous city in the San Francisco Bay Area after San Jose, San Francisco, Oakland, and Fremont; and the 28th most populous city in California.
Document 4: Santa Rosa Creek Reservoir: Santa Rosa Creek Reservoir is a reservoir in Spring Lake Regional Park in the city of Santa Rosa, California, USA. It is impounded by an earthen dam built in 1963 and owned by the Sonoma County Water Agency.
Document 5: Rosenberg's Department Store: Rosenberg's Department Store is located at Fourth and D Streets in downtown Santa Rosa, California. The structure is the most significant example of the Streamline Moderne style in Santa Rosa, and was the tallest building in the city for many years.
Document 6: Space Game: Space Game is a public artwork by American artist Joseph Mendla. The piece is located at 1515 West Canal Street, in Milwaukee, Wisconsin, United States. This piece was made originally for an indoor setting to be placed as three pieces and no base. Mendlay ended up giving this piece to Peck Meat Packing Corporation. The concrete base and lights were added. Even after the Peck family sold their slaughterhouse business in the late 1980s the sculpture still remains.
Document 7: Keen Software House: Keen Software House is an independent video game developing company based in Prague, Czech Republic. The company was founded by Marek Rosa in 2010.
Document 8: M5 Industries: M5 Industries (M5i) is a special effects company located in San Francisco, California, best known as the working lab of the TV series "MythBusters". M5 once produced special effects props for commercials and film, stop motion animation, and animatronic puppets, such as those seen in "James and the Giant Peach" and "The Nightmare Before Christmas". They also extend into prototype development and various display projects.
Document 9: Space Trader: Space Trader is a video game by the Canadian developer HermitWorks, for Microsoft Windows and Mac OS X released on July 25, 2007. After the game was open-sourced in 2008, an iOS version followed in 2009.
Document 10: Naval Auxiliary Landing Field Santa Rosa: Naval Auxiliary Landing Field (NALF) Santa Rosa, California, also known as Naval Auxiliary Air Station, Santa Rosa, was a military airport located in Santa Rosa, California, in Sonoma County, California, USA.
Document 11: Santa Rosa Rugby Club: The Santa Rosa Rugby Club is a men's rugby union team based in and around Santa Rosa, California. The club was founded in 1971. The team plays in the Northern California Rugby Football Union at the Division I level. The Santa Rosa Rugby Club won back to back national championships in 1994-95.
Document 12: Sega Studios San Francisco: Sega Studios San Francisco, formerly known as Secret Level Inc, was an American video game developer based in San Francisco, California. It was founded in December 1999 by Jeremy Gordon, Otavio Good, and Josh Adams.
Document 13: San Francisco: San Francisco (initials SF) (/ ˌsæn frənˈsɪskoʊ /, Spanish for Saint Francis; Spanish: (san franˈsisko)), officially the City and County of San Francisco, is the cultural, commercial, and financial center of Northern California. The consolidated city - county covers an area of about 47.9 square miles (124 km), mostly at the north end of the San Francisco Peninsula in the San Francisco Bay Area. It is the fourth-most populous city in California, and the 13th-most populous in the United States, with a 2016 census - estimated population of 870,887. The population is projected to reach 1 million by 2033. As of 2016, San Francisco County was the 7th highest - income county in the United States, with a per capita personal income of $110,418.
Document 14: Santa Rosa, California: Santa Rosa (lit. Spanish for ``Saint Rose '') is a city in and the county seat of Sonoma County, in California's Wine Country. Its estimated 2016 population was 175,155. Santa Rosa is the largest city in California's Redwood Empire, Wine Country and the North Bay; the fifth most populous city in the San Francisco Bay Area after San Jose, San Francisco, Oakland, and Fremont; and the 28th most populous city in California.
Document 15: Graton, California: Graton is an unincorporated town and census-designated place (CDP) in west Sonoma County, California, United States. The population was 1,707 at the 2010 census. Graton's ZIP code is 95444. The town also has a culinary reputation attributed to two restaurants in the area.
ground_truth: Sonoma County
sub_queries: Malfador Machinations >> headquarters location Answer: Santa Rosa
what part of california is Santa Rosa in Answer: Sonoma County