Question: On which network did Alf air from 1986-1990?

Context paragraphs:
The Other Ones (Australian-German band): The Other Ones were a pop rock band which formed in Berlin in 1984.  Australian-born siblings Alf Klimek (lead vocals), the twins Jayney Klimek (lead vocals) and Johnny Klimek (bass guitar) were joined by a German-born trio of Stephan Gottwald (keyboards), Andreas Schwarz-Ruszczynski (guitars) and Uwe Hoffmann (drums).  They issued two albums, "The Other Ones" (1986) and "Learning to Walk" (1988), before disbanding in 1990.  Their second single, "We Are What We Are" (May 1987), peaked in the United States "Billboard" Hot 100 and reached the top 40 on the New Zealand Singles Chart.  Its follow up, "Holiday", peaked at No. 29 in October 1987 on the US "Billboard" Hot 100, No. 10 in New Zealand, No. 4 in Germany, No. 13 in Austria and No. 22 in Switzerland.

Arab Liberal Federation: The Arab Liberal Federation (ALF; Arabic: الاتحاد الليبرالي العربي‎ ‎ ) is a network of liberal political parties, organizations and activists from Arab countries.  It was formed in 2008 in Cairo under the name of Network of Arab Liberals (NAL).  Wael Nawara of the Egyptian El-Ghad Party was elected as a first president.  The network was renamed The Arab Alliance for Freedom and Democracy in 2011, reacting to the negative connotations that the term 'liberal' has in some Arab countries.  In March 2016 the Alliance was renamed to its current name using the term 'Liberal' as ideological identification.

Duncan Stewart (Home and Away): Duncan Stewart is a fictional character from the Australian soap opera "Home and Away".  He made his first appearance during the episode broadcast on 14 June 1989.  He was initially portrayed by Allana Ellis, with actor Lewis Devaney taking over the role from 1990 to 1998.  Brendan McKensy assumed the role in 1998 until Duncan's departure in 2001.  McKensy later reprised the role in 2004 and 2005 and made his last appearance on 13 July 2005.  The character was reintroduced on 19 July 2016, with Benedict Wall cast in the role.  Duncan is the son of Ailsa (Judy Nunn) and Alf Stewart (Ray Meagher).  His 2016 reappearance marked the first time in 27 years that he, Alf and his half-sister Roo Stewart (Georgie Parker) had been on-screen together.  During his time in Summer Bay, Duncan befriends Tori Morgan (Penny McNamee), becoming a love rival for Nate Cooper (Kyle Pryor).

Alf Clausen: Alf Heiberg Clausen (born March 28, 1941) is an American film and television composer.  He is best known for his work scoring many episodes of "The Simpsons", of which he had been the sole composer between 1990 and 2017.  Clausen has scored or orchestrated music for more than 30 films and television shows, including "Moonlighting", "The Naked Gun", "ALF" and "Ferris Bueller's Day Off".

Project ALF: Project: ALF (also known as Project: ALF, Part 2) is a 1996 American made-for-television science fiction film directed by Dick Lowry which serves as a sequel to the final episode "Consider Me Gone" of the 1986–1990 sitcom "ALF".  It was broadcast in the U.S. by ABC and in Canada on CHCH on February 17, 1996.  The film was released on DVD in 2005.

List of ALF characters: A listing of the characters from the ALF television series that ran between 1986 and 1990.

ALF (season 4): This is a list of episodes from the fourth and final season of "ALF".

ALF (TV series): ALF is an American sitcom that aired on NBC from September 22, 1986, to March 24, 1990.

List of Home and Away characters (1988): "Home and Away" is an Australian television soap opera.  It was first broadcast on the Seven Network on 17 January 1988.  The following is a list of characters that first appeared in that year, by order of first appearance.  They were all introduced by the show's executive producer Alan Bateman who oversaw the serial before being succeeded by series producer Des Monaghan whose episodes first began airing in November.  Sixteen of the original eighteen regular characters debuted in the pilot episode.  The Fletcher family consisting of Frank Morgan, Tom and Pippa Fletcher, Carly Morris, Steven Matheson, Sally Keating and Lynn Davenport were introduced first.  Summer Bay residents Alf Stewart, Floss and Neville McPhee, Bobby Simpson, Donald Fisher, Ailsa Hogan, Martin Dibble, Lance Smart and Matt Wilson also made their debuts.  They were soon joined by Alf's daughter Roo and sister, Celia.  In March, Lyn Collingwood arrived as Lance's mother, Colleen.  The same month, Liddy Clark began playing Kerry Barlow and Amanda Newman-Phillips joined the cast as Narelle Smart.  In April, Gerry Sont began playing Brett Macklin, a love interest for Roo.  Barbara Stephens and Cornelia Frances arrived in June as Alf's other sisters Barbara Stewart and Morag Bellingham, respectively.  July saw Simon Kay enter as Donald and Barbara's son Alan Fisher.  Gavin Harrison began playing Revhead in August and was soon followed by John Morris as Philip Matheson.  That month saw the serial's first birth Christopher Fletcher, son of the established Tom and Pippa.  Another birth occurred in September, Martha Stewart, daughter of Roo and Brett.  Sandie Lillingston joined the cast in the same episode as Brett's sister, Stacey and in November, George Leppard guested as Al Simpson.

Anne Schedeen: Luanne Ruth Schedeen (born January 8, 1949), known professionally as Anne Schedeen, is an American actress who was born in Portland, Oregon.  She is best known for her role as Kate Tanner on "ALF," which ran from 1986 to 1990.

Supporting paragraphs: ALF (season 4) ALF (TV series)
Answer: NBC