Which of the following ventilator settings or respiratory measurements would be LEAST acceptable for a newborn with congenital diaphragmatic hernia (CDH)?
(A) 100% FiO₂
(B) PEEP of 20 cm H₂O
(C) Inhaled nitric oxide (NO)
(D) PaCO₂ of 55 mmHg
(E) PaO₂ of 65 mmHg