premise: A concert is given by a six-member band—guitarist, keyboard player, percussionist, saxophonist, trumpeter, violinist. During the concert, each member performs exactly one solo. The following restrictions apply: The guitarist does not perform the fourth solo. The percussionist performs a solo at some time before the keyboard player does. The keyboard player performs a solo at some time after the violinist does and at some time before the guitarist does. The saxophonist performs a solo at some time after either the percussionist does or the trumpeter does, but not both. Which one of the following CANNOT perform the third
hypothesis: guitarist