Defendant is charged with murder in connection with a carjacking incident during which Defendant allegedly shot Victim while attempting to steal Victim's car. The prosecutor calls Victim's four-year-old son, whose face was horribly disfigured by the same bullet, to testify that Defendant shot his father and him. The son's testimony should be 
admitted, provided the prosecutor first provides evidence that persuades the judge that the son is competent to testify despite his tender age.  admitted, provided there is sufficient basis for believing that the son has personal knowledge and understands his obligation to testify truthfully.  excluded, because it is insufficiently probative in view of the son's tender age.  excluded, because it is more unfairly prejudicial than probative.