It Is Easy to Confuse the Terms Sulcus and Gyrus

It is easy to confuse the terms sulcus and gyrus (on the cerebral cortex) . The difference between these two terms is that

A) a sulcus is the same as a fissure on the cerebral cortex, whereas a gyrus is a lobe.
B) a sulcus corresponds to a folia on the cerebellum, whereas a gyrus corresponds to a fissure.
C) a gyrus is a ridge, and a sulcus is a groove.
D) a sulcus is a groove, and a gyrus is a deeper groove.