Evaluate the Following Function at the Specified Value of the Independent

Evaluate the following function at the specified value of the independent variable and simplify.
$$f ( w ) = \frac { - 7 w ^ { 2 } + 20 } { w ^ { 2 } } ; \quad f ( 0 )$$

A) 20
B) 0
C) $- 7$
D) 13
E) undefined