A jury trial1. happens at the trial or district court level 2. prevents the more costly use of bench trial 3. is used to decide criminal but not civil cases 4. can happen in appellate courts upon request

Answer: 3. Is used to decide criminal but not civil cases.

Explanation: According to the Supreme Court, the jury-trial right applies only when "serious" offenses are at hand-petty offenses don't invoke it. For purposes of this right, a serious offense is one that carries a potential sentence of more than six months'