An oil storage tank can be described as the volume generated by revolving the area bounded by ( y={4}/{(4+x²){{1}/{4}}}, x=0, y=0, x=5 ) about the ( x )-axis. Find the volume of the tank (in cubic meters).
a) ( {125π}/{3} )
b) ( {250π}/{3} )
c) ( {375π}/{3} )
d) ( {500π}/{3} )