A 13-year-old patient with a past medical history of attention-deficit hyperactivity disorder (ADHD) presents to the clinic for routine follow-up. They were started on methylphenidate six months ago and have improved their symptoms. They have no history of cardiac disease. Vitals and physical exams are unremarkable. What is the most appropriate management? A. 24-hour ambulatory blood pressure monitoring • B. Surveillance electrocardiogram • C. Surveillance echocardiogram AD. No additional cardiac monitoring