Divide the term endarterial into and identify the meaning of its component parts.
a) Endo- (within) + arteri/o (artery) + -al (pertaining to); pertaining to within the artery
b) En- (in) + darteri/o (dartery) + -al (pertaining to); pertaining to within the dartery
c) Endo- (internal) + arterial (artery) + -al (pertaining to); pertaining to the internal artery
d) Endo- (inner) + arterial (artery) + -al (pertaining to); pertaining to the inner artery