Which of the Following Is True of the Adult Human

Which of the following is true of the adult human cerebral cortex?

A) "Limb" is a rough meaning of the term cortex.
B) The outer surface of cortex is smooth like a balloon.
C) The cortex is about 3 mm in thickness.
D) The size of human cortex, relative to body size, is smaller than that of any other species.
E) Human cortex is composed of 9 distinct cell layers.