Which of the Following Is True of the Blood-Brain Barrier

Which of the following is true of the blood-brain barrier?

A) The barrier is uniform, protecting all brain structures.
B) The barrier pumps glucose out of the brain into the bloodstream.
C) The barrier functions to regulate the chemical composition of the extracellular fluid surrounding the brain cells.
D) The barrier is formed by cells that line the capillaries of the brain.
E) The ventricles have a blood-brain barrier.