Question: Which organization owns this independent television station for which Frances Rivera worked as a television reporter and anchor until 2011?

full_context: Document 1: WHDH (TV): WHDH, channel 7, is an independent television station located in Boston, Massachusetts. WHDH is owned by Sunbeam Television, and operates as part of a duopoly with CW affiliate WLVI (channel 56). The two stations share studio facilities located at Bulfinch Place, near Government Center in downtown Boston; WHDH's transmitter is located in Newton, Massachusetts.
Document 2: WTHR: WTHR, virtual and VHF digital channel 13, is an NBC-affiliated television station licensed to Indianapolis, Indiana, United States. The station is owned by the Dispatch Broadcast Group of Columbus, Ohio, and is a sister station to MeTV affiliate WALV-CD (channel 46) and Columbus' CBS affiliate WBNS-TV (channel 10). WTHR and WALV share studio facilities located on North Meridian (south of I-65) in downtown Indianapolis; WTHR maintains transmitter facilities located near Ditch Road and West 96th Street in Carmel. On cable, WTHR is available on Comcast Xfinity and Charter Spectrum channel 12, and AT&T U-verse channel 13; and in high definition on Spectrum digital channel 1012, and Xfinity and U-verse channel 1013.
Document 3: Meredith Vieira: Meredith Louise Vieira (born December 30, 1953) is an American journalist, talk show and game show host. She is known for serving as the original moderator of the ABC talk show, "The View" (1997–2006), and for co-hosting the long-running NBC News morning news program, "Today" (2006–2011).
Document 4: Catherine Mylinh: Catherine Mylinh is an American journalist. Her latest assignments were for the NBC affiliate in Fresno, where she covered the Central Valley from January 2005 to May 2008. She also served as KSEE weekend anchor, first for KSEE Sunrise Saturdays (2005–2006), then as evening reader for KSEE 24 News at 6/11 p.m. (2006–2007). Catherine was also part of the KSEE Weather Plus team. In July 2008, Catherine began appearing on-air as a weather anchor for KNTV NBC11 in the San Francisco Bay Area.
Document 5: WBZ-FM: WBZ-FM is a sports radio station known as "98.5 The Sports Hub" and broadcasting on 98.5 MHz in Boston, Massachusetts. Owned by CBS Radio, the current WBZ-FM began on August 8, 2009 and competes with AM and FM sports talk station WEEI/WEEI-FM. WBZ-FM is home to the Boston Bruins, New England Patriots, Boston Celtics and New England Revolution radio networks. Its studios are located in Allston district of Boston, and its transmitter is in Newton.
Document 6: WBOS: WBOS (92.9 MHz, "Alt 92.9") is a commercial FM radio station licensed to Brookline, Massachusetts and broadcasting to the Greater Boston media market. The station airs an alternative rock radio format, using the branding "Alt 92.9". WBOS is owned and operated by Beasley Broadcast Group. Its studios are located in the Dorchester neighborhood of Boston and its transmitter is on the top of the Prudential Tower in Boston's Back Bay.
Document 7: April Ryan: April Danielle Ryan (born September 5, 1967) is an American journalist and author. Since 1997, she has served as a White House correspondent and is the Washington, D.C., bureau chief for American Urban Radio Networks. She is among the best known of the White House press corps. In 2017, she joined CNN as a political analyst. In May 2017, the National Association of Black Journalists named Ryan as the "Journalist of the Year".
Document 8: Frances Rivera: Frances Rivera (born 1970 ) is a Filipino-American journalist and television news anchor. For ten years, until August 2011, she had been a television reporter and anchor for Boston's NBC affiliate, WHDH. From 2011-2013, she was a morning news anchor for WPIX in New York City. In February 2014, she joined NBC News and MSNBC where she serves as Thomas Roberts co-anchor on "MSNBC Live" airing weekdays from 1-3pm ET.
Document 9: Joe Fryer: Joe Fryer is an American journalist and storyteller working for NBC News as a west coast correspondent based at the NBC News West Coast Bureau in Universal City, California. Fryer joined NBC News in 2013 as a part-time correspondent and officially joined NBC News as a full-time correspondent on October 21, 2013.
Document 10: Martha MacCallum: Martha MacCallum (born January 31, 1964) is a news anchor for Fox News. She joined the network in 2004. She previously hosted "The Live Desk" with Trace Gallagher and 'America's Newsroom' alongside Bill Hemmer. MacCallum was also often the fill-in anchor for Megyn Kelly while "The Kelly File" was still running. In January 2017, MacCallum became anchor of Fox News's temporary program, "The First 100 Days", which was later reformatted into a permanent show called "The Story with Martha MacCallum". MacCallum also had a weekly segment with Bill O'Reilly on "The O'Reilly Factor".
Document 11: WPCH-TV: WPCH-TV, virtual channel 17 (UHF digital channel 20), is an independent television station licensed to Atlanta, Georgia, United States. The station is owned by Meredith Corporation as part of a duopoly with CBS affiliate WGCL-TV (channel 46). The two stations share studio facilities located on 14th Street in northwestern Atlanta; WPCH maintains transmitter facilities located in North Druid Hills. From 1970 to 2017, the station was owned by Turner Broadcasting System, which is now a subsidiary of Time Warner. Prior to the end of Turner's ownership, WPCH-TV was the only broadcast television station owned by Time Warner.
Document 12: WWDP: WWDP, virtual channel 46 (VHF digital channel 10), is an Evine-affiliated television station serving Boston, Massachusetts, United States that is licensed to Norwell. The station broadcasts on digital VHF channel 10. It airs home shopping programs from, and is owned by EVINE Live, Inc. WWDP maintains studios on Bert Drive in West Bridgewater, and its transmitter is located off Pleasant Street in West Bridgewater.
Document 13: WCSH: WCSH is the NBC-affiliated television station for southern Maine as well as eastern and northern New Hampshire in the United States. Licensed to Portland, it broadcasts a high definition digital signal on UHF channel 44 (or virtual channel 6 via PSIP) from a transmitter on Winn Mountain in Sebago. Owned by Tegna, WCSH has studios at Congress Square in Downtown Portland.
Document 14: Bill Fitzgerald: Bill Fitzgerald is a television news anchor and reporter. He anchors evening newscasts for WTVR in Richmond, VA and is a former MSNBC overnight anchor. He was also the news anchor for WNCN (NBC-17) with co-anchor Melanie Sanders and meteorologist Wes Hohenstein weeknights at 6, 7 and 11 pm. He was released from WNCN in December 2008, almost 2 years after joining, due to economic downsizing by parent company Media General. Prior to joining WNCN, Fitzgerald was an anchor for MSNBC. Prior to joining MSNBC, Fitzgerald served as weekend anchor and general assignment reporter for the NBC owned-and-operated station WVTM-TV in Birmingham, Alabama.
Document 15: Early Today: Early Today is an American early morning television news program that is broadcast on NBC. The program features general national and international news stories, financial and entertainment news, off-beat stories, national weather forecasts and sports highlights. s of 2017 , it is anchored by Frances Rivera and Phillip Mena.
ground_truth: Sunbeam Television