A. The court shall conduct a separate sentencing proceeding to determine any controverted question of fact regarding whether the defendant has been convicted of three violent felonies. Either party to the action may demand a jury trial.
B. In a jury trial, the sentencing proceeding shall be conducted as soon as practicable by the original trial judge before the original trial jury. In a nonjury trial, the sentencing shall be conducted as soon as practicable by the original trial judge. In the case of a plea of guilty, the sentencing proceeding shall be conducted as soon as practicable by the original trial judge or by a jury upon demand of the defendant.
C. In a jury sentencing proceeding, the judge shall give appropriate instructions and allow arguments. The jury shall retire to determine the verdict. In a nonjury sentencing proceeding, or upon a plea of guilty where no jury has been demanded, the judge shall allow argument and determine the verdict.