Which expression represents the volume, in cubic units, of the shaded part of the sphere?
A
4 thirds pi open paren 20 cubed close paren minus 4 thirds pi open paren 4 cubed close parenB
4 thirds pi open paren 10 cubed close paren minus 4 thirds pi open paren 4 cubed close parenC
4 thirds pi open paren 20 cubed close paren plus 4 thirds pi open paren 4 cubed close parenD
4 thirds pi open paren 10 cubed close paren plus 4 thirds pi open paren 4 cubed close paren