A newborn is noted to be cyanotic in the first few hours of life.She is comfortable and in no repiratory distress.The remainder of her physical examination is remarkable only for a single second heart sound.By echocardiography, d-transposition of great arteries is diagnosed.All of the following statements regarding d-transposition of the great arteries are true except -

• A. The aortic valve is to the right of the pulmonary artery
• B. The aortic valve is posterior to the pulmonary valve
• C. The right ventricular pressure is elevated
• D. A balloon arterial septostomy should be performed to improve systemic oxygenation