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

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.