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.
$f ( u ) = \frac { 4 u ^ { 2 } + 12 } { u ^ { 2 } } ; \quad f ( 0 )$

A) 12
B) 0
C) 4
D) 16
E) undefined