What is the correct order of the meninges, starting at the layer closest to the brain/spine?
a) Pia mater, arachnoid mater, dura mater
b) Dura mater, pia mater, arachnoid mater
c) Arachnoid mater, dura mater, pia mater
d) Pia mater, dura mater, arachnoid mater