Question: When was the arena that hosted the 2015 Audi quattro Cup officially opened ?
Sentence (from "Red Bull Arena (Salzburg)"): The Red Bull Arena (] ; known for UEFA Euro 2008 as the EM-Stadion Wals-Siezenheim ] and during UEFA club football events as Stadion Salzburg) is a football stadium in Wals-Siezenheim, a municipality in the suburb of Salzburg, Austria.
Relevant evidence: No