Evaluate F(0) If $f ( x ) = \left\{ \begin{array} { l l } 9 x + 6 , & x < 0 \\9 x + 9 , & x \geq 0\end{array} \right.$

Evaluate f(0) if $f ( x ) = \left\{ \begin{array} { l l } 9 x + 6 , & x < 0 \\9 x + 9 , & x \geq 0\end{array} \right.$ .

A) f(0) = -9
B) f(0) = 6
C) f(0) = 9
D) f(0) = -6
E) f(0) = 0