For parasympathetic innervation, describe the relative length of pre- and post-ganglionic neurons:
a. Short pre-ganglionic, short post-ganglionic neurons
b. Short pre-ganglionic, long post-ganglionic neurons
c. Long pre-ganglionic, long post-ganglionic neuronss
d. Long pre-ganglionic, short post-ganglionic neurons
d.long pre-ganglionic, short post-ganglionic neurons