What is the normal range for intracranial pressure (ICP)?

A. 20-30 mmHg is above the normal range and indicates elevated ICP, which can be dangerous. B. 40-50 mmHg is critically high and requires urgent medical intervention. C. 50-100 mmHg is dangerously high and not compatible with normal brain function. D. Normal intracranial pressure ranges from 5 to 15 mmHg. Values within this range indicate normal pressure within the skull, allowing for proper brain perfusion and function.