Question: Which football club hosted the 2017 Emirates Cup which featured RB Leipzig?

Context paragraphs:
2017–18 RB Leipzig season: The 2017–18 RB Leipzig season is the 9th season in the football club's history and 2nd consecutive and overall season in the top flight of German football, the Bundesliga, having been promoted from the 2.  Bundesliga in 2016.  In addition to the domestic league, RB Leipzig also are participating in this season's editions of the domestic cup, the DFB-Pokal, and the first-tier continental cup, the UEFA Champions League.  This is the 8th season for Leipzig in the Red Bull Arena, located in Leipzig, Saxony, Germany.  The season covers a period from 1 July 2017 to 30 June 2018.

2016–17 RB Leipzig season: The 2016–17 RB Leipzig season is the 8th season in the football club's history and 1st ever season in the top flight of German football, the Bundesliga, having been promoted from the 2.  Bundesliga in 2016.  RB Leipzig will also participate in this season's edition of the domestic cup, the DFB-Pokal.  The season covers a period from 1 July 2016 to 30 June 2017.

2008 Emirates Cup: The 2008 Emirates Cup was a pre-season football friendly tournament hosted by Arsenal at its home ground, the Emirates Stadium.  It was the second Emirates Cup, an invitational competition inaugurated in 2007.  Held on the weekend of 2–3 August 2008, the participants were Arsenal, Real Madrid, Juventus, and Hamburg.

RB Leipzig: RasenBallsport Leipzig e.V., commonly known as RB Leipzig, is a German association football club based in Leipzig, Saxony.  The club was founded in 2009 by initiative of energy drink-maker Red Bull GmbH who purchased a playing right of the fifth division side SSV Markranstädt with the intention of advancing the new club to the top-flight Bundesliga within eight years.  Men's professional football is run by the spin-off organization "RasenballSport Leipzig GmbH".  RB Leipzig plays its home matches at the Red Bull Arena.

Emirates Cup: The Emirates Cup is a pre-season association football invitational competition hosted by English club Arsenal at their home ground Emirates Stadium, in Holloway, London.  The two-day competition was inaugurated in 2007, and is named after Arsenal's main sponsor Emirates.  It has been held every summer except 2012 due to the London Olympics, and 2016 because of pitch renovation work.

1991–92 European Cup: The 1991–92 season of the European Cup football club tournament was won for the first time by Barcelona after extra time in the final against Sampdoria, the first victory in the tournament by a team from Spain since 1966.  The winning goal was scored by Ronald Koeman with a free kick.  This was the last tournament before the competition was re-branded as the UEFA Champions League.  It was the first to have a group stage involving the eight second-round winners split into two groups, and the winner of each one met in the final.  In addition, it was the last time an East Germany team competed in European Cup until RB Leipzig's qualification for the 2017–18 UEFA Champions League.

2017 Emirates Cup: The 2017 Emirates Cup was a pre-season football friendly tournament hosted by Arsenal at its home ground, the Emirates Stadium.  It was the ninth Emirates Cup, an invitational competition inaugurated in 2007.  Held on the weekend of 29–30 July 2017, the participants were Arsenal, Sevilla, Benfica, and RB Leipzig.  It was the first edition since 2015 as pitch reconstruction works put the tournament on hiatus in 2016.

Ralf Rangnick: Ralf Rangnick (AKA, Wreck-It-Ralf) (born 29 June 1958) is a German football manager and former amateur player who is currently the director of sports of Bundesliga club RB Leipzig.  In the 2015–16 season, he served as manager of RB Leipzig, who had just been promoted to the 2.  Bundesliga and guided the team to promotion to the Bundesliga.

2007 Emirates Cup: The 2007 Emirates Cup was the inaugural pre-season men's association football friendly tournament hosted by Arsenal.  It took place at the club's home ground, the Emirates Stadium during the weekend of 28 July and 29 July 2007.  The idea of a pre-season competition staged at Arsenal first came about during the 2006–07 season; once planning was complete, the club invited three other European clubs to participate in the event: Inter Milan, Paris Saint-Germain and Valencia.  The latter club replaced Hamburg as the German side had Intertoto Cup commitments.

2009 Emirates Cup: The 2009 Emirates Cup was a pre-season football friendly tournament hosted by Arsenal at its home ground, the Emirates Stadium.  It was the third Emirates Cup, an invitational competition inaugurated in 2007.  Held on the weekend of 1–2 August 2009, the participants were Arsenal, Atlético Madrid, Rangers, and Paris Saint-Germain.

Supporting paragraphs: 2017 Emirates Cup RB Leipzig
Answer: Arsenal