Question: Who is the original broadcaster of NHL and Cos?

full_context: Document 1: Saturday Night Live (season 1): When the first show aired on October 11, 1975 with George Carlin as its host, it was called NBC's Saturday Night because ABC featured a program at the same time titled Saturday Night Live with Howard Cosell. After ABC cancelled the Cosell program in 1976, the NBC program changed its name to Saturday Night Live on March 26, 1977 (and subsequently picked up Bill Murray from Cosell's show in 1977, as well). Every night, Don Pardo introduced the cast, a job he'd hold for 39 years until his death in 2014.
Document 2: NHL on CBS: The NHL on CBS is the branding used for broadcasts of National Hockey League (NHL) games produced by CBS Sports, the sports division of the CBS television network in the United States, for three separate periods from 1957 to 1960, 1967 to 1972 and 1979 to 1980. With the original 1957 game telecasts, CBS became the first American television network to broadcast NHL games.
Document 3: The Cosby Show: The Cosby Show is an American television sitcom starring Bill Cosby, which aired for eight seasons on NBC from September 20, 1984 until April 30, 1992. The show focuses on the Huxtable family, an upper middle - class African - American family living in Brooklyn, New York.
Document 4: Arena Football League: Beginning with the 2003 season, the AFL made a deal with NBC to televise league games, which was renewed for another two years in 2005. In conjunction with this, the league moved the beginning of the season from May to February (the week after the NFL's Super Bowl) and scheduled most of its games on Sunday instead of Friday or Saturday as it had in the past. In 2006, because of the XX Winter Olympic Games, the Stanley Cup playoffs and the Daytona 500, NBC scaled back from weekly coverage to scattered coverage during the regular season, but committed to a full playoff schedule ending with the 20th ArenaBowl. NBC and the Arena Football League officially severed ties on June 30, 2006, having failed to reach a new broadcast deal. Las Vegas owner Jim Ferraro stated during a radio interview that the reason why a deal failed is because ESPN refused to show highlights or even mention a product being broadcast on NBC.
Document 5: Arena Football League: On December 19, 2006, ESPN announced the purchase of a minority stake in the AFL. This deal included television rights for the ESPN family of networks. ESPN would televise a minimum of 17 regular season games, most on Monday nights, and nine playoff games, including ArenaBowl XXI on ABC. The deal resulted in added exposure on ESPN's SportsCenter. However, after the original AFL filed for bankruptcy, this arrangement did not carry over to the new AFL, which is a separate legal entity.
Document 6: The Cosby Show: The Cosby Show is an American television sitcom co-created and starring Bill Cosby, which aired for eight seasons on NBC from September 20, 1984, until April 30, 1992. The show focuses on an upper middle-class black family living in Brooklyn, New York.
Document 7: House of Cosbys: House of Cosbys is an American animated sitcom created by Justin Roiland for the film festival Channel 101. The series centers on Mitchell Reynolds (Jeff Davis), who builds a cloning machine to make duplicates of his favorite comedian, Bill Cosby. The show stars Davis, Roiland, and a rotating cast of performers, many of whom were participants at Channel 101. The series premiered January 30, 2005, and was the number one-rated program on the site for three months. Four episodes of the series were created, which debuted at Channel 101 screenings and were posted online thereafter. The series concluded on June 26, 2005 with an "unofficial" fifth installment.
Document 8: ESPN College Basketball on ABC: ESPN College Basketball on ABC (originally College Basketball on ABC) is the branding formerly used for broadcasts of NCAA Division I college basketball games produced by ESPN, and televised on the American Broadcasting Company (ABC). ABC broadcast select college basketball games during the 1960s and 1970s, before it began televising them on a regular basis on January 18, 1987 (involving a game between the LSU Tigers and Kentucky Wildcats). As CBS and NBC were also broadcasting college games at the time, this put the sport on all three major broadcast television networks. ABC's final regular college basketball broadcast aired on March 7, 2009 (between the Oklahoma State Cowboys and Oklahoma Sooners).
Document 9: The Carol Burnett Show: The Carol Burnett Show is an American variety/sketch comedy television show starring Carol Burnett, Harvey Korman, Vicki Lawrence, and Lyle Waggoner. Original episodes ran from 1967 to 1978. In 1975, frequent guest star Tim Conway became a regular after Waggoner left the series. In 1977, Dick Van Dyke replaced Korman but it was agreed that it was not a match and he left after 10 episodes. The show originally ran on CBS from September 11, 1967, to March 29, 1978, for 279 episodes, and again with nine episodes in the fall of 1991. The series originated in CBS Television City's Studio 33, and won 25 primetime Emmy Awards, was ranked number 16 on "TV Guide"s 50 Greatest TV Shows of All Time in 2002, and in 2007 was listed as one of "Time" magazine's 100 Best TV Shows of All Time.
Document 10: Cos (TV series): Cos is an American sketch comedy/variety TV series that debuted on the ABC Network in September 1976. It was hosted by comedian Bill Cosby and featured an ensemble cast who would perform sketches each week. The show was unsuccessful in the Nielsen ratings and was cancelled by November 1976 and replaced with "The Hardy Boys/Nancy Drew Mysteries".
Document 11: ESPN College Football on ABC: ESPN College Football on ABC (branded for sponsorship purposes as ESPN College Football on ABC presented by Walmart or Kay Jewelers) is the branding used for broadcasts of National Collegiate Athletic Association (NCAA) Division I Football Bowl Subdivision (FBS) college football games that are produced by ESPN, and televised on the American Broadcasting Company (ABC) in the United States. ABC first began broadcasting regular season college football games in 1950 and has aired them on an annual basis since 1966. The network features games from The American, Atlantic Coast, Big Ten, Big 12, and Pac-12 conferences. In addition, ESPN also produces a separate prime time regular-season game package for ABC, under the umbrella brand "Saturday Night Football". (ESPN and ABC are both owned by The Walt Disney Company).
Document 12: NHL on ABC: The NHL on ABC is the branding formerly used for broadcasts of National Hockey League (NHL) games televised on the American Broadcasting Company (ABC) in the United States. The network first broadcast NHL games during the 1992–93 season under a time-buy agreement with ESPN; ABC resumed regular season game telecasts on February 6, 2000, as part of a joint contract with ESPN that also gave ABC the rights to select games from each round of the Stanley Cup playoffs.
Document 13: PGA Tour on ABC: PGA Tour on ABC is the "de facto" branding used for telecasts of the main professional golf tournaments of the PGA Tour on the American Broadcasting Company (ABC) television network in the United States. ABC broadcast the PGA Tour from 1966 to 2006. From 1962 to 2009, ABC served as the broadcast home of The Open Championship. The British Open on ABC was the longest-running entertainment program in ABC's history and the last-surviving ABC program to debut in the "circle a" era. ABC also held the broadcast rights of the US Open from 1966 through 1994. and the PGA Championship from 1965 until 1990.
Document 14: CBC Television: One of the most popular shows on CBC Television is the weekly Saturday night broadcast of NHL hockey games, Hockey Night in Canada. It has been televised by the network since 1952. During the NHL lockout and subsequent cancellation of the 2004-2005 hockey season, CBC instead aired various recent and classic movies, branded as Movie Night in Canada, on Saturday nights. Many cultural groups criticized this and suggested the CBC air games from minor hockey leagues; the CBC responded that most such broadcast rights were already held by other groups, but it did base each Movie Night broadcast from a different Canadian hockey venue. Other than hockey, CBC Sports properties include Toronto Raptors basketball, Toronto FC Soccer, and various other amateur and professional events.
Document 15: American Idol: Season six premiered with the series' highest-rated debut episode and a few of its succeeding episodes rank among the most watched episodes of American Idol. During this time, many television executives begun to regard the show as a programming force unlike any seen before, as its consistent dominance of up to two hours two or three nights a week exceeded the 30- or 60-minute reach of previous hits such as NBC's The Cosby Show. The show was dubbed "the Death Star", and competing networks often rearranged their schedules in order to minimize losses. However, season six also showed a steady decline in viewership over the course of the season. The season finale saw a drop in ratings of 16% from the previous year. Season six was the first season wherein the average results show rated higher than the competition stages (unlike in the previous seasons), and became the second highest-rated of the series after the preceding season.
ground_truth: American Broadcasting Company
sub_queries: Cos >> original broadcaster Answer: ABC
NHL on ABC >> original broadcaster Answer: American Broadcasting Company