(a)Generally Subject to section (b) of this Rule, for good cause, the court may enter a final order terminating its jurisdiction over a respondent prior to the expiration of the court's jurisdiction by operation of law (1) on motion of a party, (2) on the court's own initiative, or (3) on the recommendation of an appropriate governmental agency exercising supervision or custody of the respondent.See Code, Courts Article, § 3-8A-24. Cross reference: See Code, Courts Article, § 3-8A-24, addressing the duration of an order in a delinquency or CINS case. Under subsection (c), an order under Courts Article, Title 3, Subtitle 8A "is not effective after the child becomes 21 years old."