Question: Who is the British composer that composed music for a documentary of a British distance runner born in 1983 who also performed his final track race at the 2017 IAAF Diamond League?

Context paragraphs:
Mo Farah: Sir Mohamed Muktar Jama "Mo" Farah, {'1': ", '2': ", '3': ", '4': "} (Somali: "Maxamed Mukhtaar Jaamac Faarax" ; born 23 March 1983) is a British distance runner.  On the track, he mostly competed over 5000 metres and 10,000 metres, but has run competitively from 1500 metres to the marathon.  In 2017 he indicated his intention to switch wholly to road racing following victory at his final track race, the 2017 IAAF Diamond League 5000 metres final.

IAAF Diamond League: The IAAF Diamond League is an annual series of elite track and field athletic competitions.  The series began with the 2010 IAAF Diamond League.  It was designed to replace the IAAF Golden League, which had been held annually since 1998.

2017 IAAF Diamond League: The 2017 IAAF Diamond League is the eighth edition of the annual IAAF Diamond League, a fourteen-leg series of track and field meetings.  It is the first to feature the new championship-style system in which overall event winners are determined only by the results of the final meet.

2012 IAAF Diamond League: The 2012 IAAF Diamond League (also known as the 2012 Samsung Diamond League for sponsorship purposes) is the third edition of the Diamond League, an annual series of fourteen one-day track and field meetings.

Julian Reus: Julian Reus (born 29 April 1988) is a German track and field athlete who competes in the sprints. His personal best over 100 metres of 10.01 seconds is the German record.  Though unofficial according to IAAF regulations of a maximum +2.0m/s tailwind for a valid time, he also clocked an impressive 9.99 seconds during the men's 100 metres at the 2017 IAAF Diamond League.

2016 IAAF Diamond League: The 2016 IAAF Diamond League is the seventh edition of the annual IAAF Diamond League, fourteen-leg series of track and field meetings.

Ian Arber: Ian Arber is a British composer for film and television.  He is based in London, England, but often works in Los Angeles, USA.  He composed the music for BBC2's comedy-series Quacks, Usain Bolt's theatrical-release documentary I Am Bolt, Mo Farah's documentary "No Easy Mile", and John Hurt's final movie My Name is Lenny Ian also notably assisted composer Joe Kraemer on his score for .

2011 IAAF Diamond League: The 2011 IAAF Diamond League (also known as the 2011 Samsung Diamond League for sponsorship purposes) was the second edition of the Diamond League, an annual series of fourteen one-day track and field meetings.  The series began on 6 May in Doha, Qatar and ended on 16 September in Brussels, Belgium.

Ayanleh Souleiman: Ayanleh Souleiman (born 3 December 1992), also known as "Hassan Ayanleh", is a Djiboutian middle distance runner who specialises in the 1500 metres.  He is the Djiboutian record holder for the distance, with his best of 3:29.58 minutes, as well as being the 3000 metres holder with 7:42.22 minutes.  He also holds the indoor world record for the 1000-meter which he achieved at the 2016 Globengalan event in Stockholm Sweden.  He also set a new IAAF Diamond League record at the IAAF Diamond League in August 2016 in the men's 1000 meters

2015 IAAF Diamond League: The 2015 IAAF Diamond League was the sixth edition of the annual IAAF Diamond League.  It consisted of fourteen one-day track and field meetings, starting on 15 May in Doha, Qatar, and ending on 11 September in Brussels, Belgium.  Other events were held in Shanghai, Eugene, Rome, Birmingham, Oslo, New York City, Paris, Lausanne, Fontvieille, Monaco, London, Stockholm, and Zürich.  All previous venues remained on the tour, with the exception that London returned to host the second meeting in the United Kingdom, having been replaced by Glasgow during the 2014 IAAF Diamond League.

Supporting paragraphs: Ian Arber Mo Farah
Answer: Ian Arber