The court shall swear the grand jurors and charge them to inquire into every offense for which any person has been held to answer and for which an indictment or information has not been filed, or other offenses which come to their attention or of which any of them has knowledge. The court shall further instruct the grand jurors concerning (a) their right to exclude the attorney for the Commonwealth while questioning witnesses, (b) their rights and duties to juvenile cases as provided in KRS 640.010, and (c) any other matter affecting their rights and duties as grand jurors which the court believes will assist them in the conduct of their business.