The central nervous system is made up of
sensory organs and muscles.
the brain and muscles.
the sensory organs and spinal cord.
the brain and spinal column.

the brain and spinal column.

Explanation:

The nervous system is broadly divided into two branches - the central and the peripheral nervous system out of which the central nervous system consists of the brain and the spinal cord. The main function of the central nervous system is to integrate the information and then perform the necessary control to perform different functions. The two main components of the central nervous system - the brain and the spinal cord are enclosed in protective layers known as meninges.The brain is further enclosed in the skull and the spinal cord lies caudally to it. 

Atransverse wave (lowest wave) and a the transverse  wave's wavelength .