Evaluate $f ( - 1 )$ $f ( 0 )$ $f ( 1 )$

Evaluate $f ( - 1 )$ , $f ( 0 )$
, $f ( 1 )$
, for the piecewise-defined function. $f ( x ) = \left\{ \begin{array} { l l } 1 - 2 x & \text { if } x \leq 0 \\2 x - 1 & \text { if } x > 0\end{array} \right.$

A) $f ( - 1 ) = 3$
, $f ( 0 ) = - 1$
, $f ( 1 ) = 2$
B) $f ( - 1 ) = 0$
, $f ( 0 ) = 3$
, $f ( 1 ) = - 3$
C) $f ( - 1 ) = - 1$
, $f ( 0 ) = 0$
, $f ( 1 ) = 1$
D) $f ( - 1 ) = - 1$
, $f (0 ) = 1$

, $f ( 1 ) = 1$
E) none of these