When the jurors have agreed upon a verdict they shall be conducted into the courtroom by the officer having them in charge. The court shall ask the foreperson if an agreement has been reached on a verdict. If the foreperson answers in the affirmative, the judge shall call on the foreperson to deliver the verdict in writing to the clerk. The court may then examine the verdict and correct it as to matters of form with the unanimous consent of the jurors. The clerk shall then read the verdict to the jurors and, unless disagreement is expressed by one or more of them or the jury is polled, the verdict shall be entered of record, and the jurors discharged from the cause. No verdict may be rendered unless all of the trial jurors concur in it.