Which of the following differences between the central nervous system and the autonomic nervous system is incorrect?

A) CNS - one neuron to effector; ANS - two neurons to effector
B) CNS - innervates skeletal muscle; ANS - innervates smooth and cardiac muscles and glands
C) CNS - axons myelinated; ANS - preganglionic axons myelinated, postganglionic axons unmyelinated
D) CNS - always excitatory; ANS - always inhibitory