challenge: Who are the members of Keith Jarrett's 'Standards Trio' that performed at the Montreux Jazz Festival in 2001?
  
  A. Keith Jarrett, Jack DeJohnette, and Gary Peacock
  B. Keith Jarrett, Brad Mehldau, and Brian Blade
  C. Keith Jarrett, Gary Peacock, and Charlie Haden
  D. Keith Jarrett, Herbie Hancock, and Wayne Shorter
  Answer: 