A mother brings her 11-year-old son in for outpatient servic…

A mother brings her 11-year-old son in for outpatient services. She reports that her son has been having mood swings for the past 1-2 years, he has frequent temper outbursts, and his mood is extremely irritable. She states his symptoms have caused a lot of problems at home and at school. Which of the following is the most likely diagnosis based on the symptoms reported?