Signs of cerebral herniation and optimal ETCO2 range for these patients:
a. Hyperventilation and ETCO2 less than 20 mmHg b. Bradypnea and ETCO2 greater than 50 mmHg c. Hypertension and ETCO2 less than 30 mmHg d. Decerebrate posturing and ETCO2 30-35 mmHg