About the classification and characteristics of efferent nervous system, which of the following statements is true?

A、Both afferent and efferent nerves belong to peripheral nervous system.;
B、Sympathetic nerve belongs to autonomic nervous system.;
C、Parasympathetic nerve contains pre-ganglion and post-ganglioic fibers.;
D、The effect of somatic nervous system can be completed by one fiber.;
E、All of the above are right.