Question: Jim Horner has served stints as manager of minor league clubs in which Washington farm team system?

Context paragraphs:
Columbus Golden Seals: The Columbus Golden Seals were a minor league professional ice hockey team in the International Hockey League from 1971 to 1973.  Columbus operated as a farm team to the National Hockey League's California Golden Seals.  The owner of the NHL Seals, Charlie Finley, had acquired the IHL franchise rights to the dormant Columbus Checkers to create the farm team.  In 1973, Finley sold the Columbus Golden Seals.  The new owner, Al Savill, renamed the team the Columbus Owls for the 1973–74 season.

Buffalo Stadium: Buffalo Stadium was a minor league stadium primarily used by the Houston Buffaloes from 1928 through 1961 (except for 1943 to 1945 because of World War II).  It was the site of the first night game between two major league baseball clubs, which took place between the Chicago White Sox and New York Giants in 1931.  The Buffaloes were a farm team of the Major League St. Louis Cardinals and provided many great ballplayers to the Cardinals' success in 1930s and 1940s.  The arrival of the National League Houston Colt .45s in 1962 brought an end to minor league baseball in Houston.  It also went by the names of Buff Stadium and later Busch Stadium.  It was bounded by Leeland Street, St. Bernard Street (present-day Cullen Boulevard), Coyle Street, and Milby Street in the East End.  The railroad tracks leading to Union Station, site of the Houston Astros' current ballpark, ran behind the center field wall.  Near the University of Houston, the stadium was also home to the Houston Cougars baseball team during the 1940s.

Lynchburg Hillcats: The Lynchburg Hillcats are a minor league baseball team in Lynchburg, Virginia.  They are a Class A Advanced team in the Carolina League, and currently are a farm team of the Cleveland Indians.  They had been a farm team of the Atlanta Braves from 2011 to 2014, the Cincinnati Reds in 2010, and the Pittsburgh Pirates from 1995 to 2009.  The Hillcats play home games at Calvin Falwell Field; refurbished and renamed in 2004, the stadium seats 4,291 fans.

Seattle Mariners: The Seattle Mariners are an American professional baseball team based in Seattle, Washington.  The Mariners compete in Major League Baseball (MLB) as a member club of the American League (AL) West Division.  The team joined the AL as an expansion team in 1977.  Since July 1999 , the Mariners' home ballpark has been Safeco Field, located in the SoDo neighborhood of Seattle.

Arizona League Athletics: The Arizona League Athletics are a Minor League Baseball team based in Phoenix, Arizona, which plays as a rookie level team in the Arizona League and has served as a farm team for the Oakland Athletics organization since 1988.  They play their home games at Lew Wolff Training Complex, the minor league spring training camp of the Oakland Athletics.

Mike Sarbaugh: James Michael Sarbaugh (born April 25, 1967) is a baseball coach for the Cleveland Indians of Major League Baseball (MLB).  He is a former minor league baseball player and minor league manager for the Columbus Clippers, the AAA farm team of the Indians.  He has served as the third base/infielders coach for the Indians since 2013.

Jim Horner: James Patrick Horner (born (1973--) 11, 1973 in Snoqualmie, Washington) is an American professional baseball manager and a former minor league baseball player.  Horner currently serves as an assistant baseball coach at Washington State University.  He was previously the pilot of the Class A Wisconsin Timber Rattlers (2006–2007), High Desert Mavericks (2008–2010; 2013) and Class AA Jackson Generals (2014-2015) all Seattle Mariners affiliates.

Calvin Griffith Park: Clark Griffith Park or better known as Griffith Park was a stadium in Charlotte, North Carolina, located at 400 Magnolia Avenue in the Dilworth section of town.  The park opened in 1941 and held as many as 5,000 people in a covered grandstand which extended from first base to third base.  It was primarily used for baseball, and served as the home field for the Charlotte Hornets, the farm team for the Washington Senators from 1937 to 1961, and Minnesota Twins from 1961 to 1972, and the Charlotte Orioles, a AA Southern League farm team of the Baltimore Orioles from 1976 to 1987.  After a renovation of the park in 1976 for the O's, the park was renamed Jim Crockett Memorial Park in 1977 (but was mostly called Crockett Park), both in honor of the promoter who brought the team, and to distance themselves from the former owners.  The park was almost completely burned down on March 16, 1985.  Investigators determined the fire was set by juveniles.

Spokane Indians: The Spokane Indians are a Minor League Baseball team in the northwest United States, located in Spokane, Washington.  A member of the short-season Class A-Short Season Northwest League, they have been a farm team of the Texas Rangers since 2003.  The Indians play home games at Avista Stadium, which opened in 1958 and has a seating capacity of 6,752.  From 1958 through 1982, the Indians were in the Triple-A Pacific Coast League, except in 1972.  The Indians have won 12 league titles: four in the PCL and eight in the NWL.  The city has over a century of history in minor league baseball, dating back to the 1890s.

Peninsula Pilots (minor league team): The Peninsula Pilots were a Minor League Baseball team located in Hampton, Virginia.  They began play in the Carolina League in 1963 as a Washington Senators farm team.  The 1980 team was named the 74th best Minor League team of the 20th century in a list by two noted minor league historians, Bill Weiss and Marshall Wright.  The team was known as the Peninsula Senators (1963), Grays (1964-1968), Astros (1969), Phillies (1970-71), Whips (1972-1973), Pennants (1974) and White Sox in 19861987 while affiliated with the Chicago White Sox, and as the Virginia Generals in 1988 when they operated as an unaffiliated co-op club.  They regained their original name in 1989 and major league affiliation returned in 1990 with the Seattle Mariners (19901992).  The team's existence ended after the 1992 season when they relocated to Wilmington, Delaware and became the Wilmington Blue Rocks.

Supporting paragraphs: Jim Horner Seattle Mariners
Answer: Seattle Mariners