Q. A 17-year-old female comes to the family clinic with her mother due to delayed menstruation. The patient has no medical history and is doing well in high school. Her family history is unremarkable. The patient's sister began menstruation at the age of 13. The patient's vital signs demonstrate a blood pressure of 160/90 mmHg, heart rate of 90/min, respiratory rate 12/min, and temperature of 37.2 degrees Celsius. On physical examination, the patient is of short stature with a wide carrying angle, and has a small jaw with low-set ears. Her neck is thick with extra skin folds. Breast development is Tanner stage 1. Cardiac auscultation is unremarkable. Which of the following heart defects would you expect to find in this patient?