Give a Rule for the Piecewise-Defined Function $f ( x ) = \left\{ \begin{array} { l l } 4 & \text { if } x \leq 0 \\ - x & \text { if } x > 0 \end{array} \right.$

Give a rule for the piecewise-defined function. Then give the domain and range.
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A) $f ( x ) = \left\{ \begin{array} { l l } 4 & \text { if } x \leq 0 \\ - x & \text { if } x > 0 \end{array} \right.$ ; Domain: $( \infty , \infty )$ , Range: $( \infty , 0 ) \cup \{ 4 \}$
B) $f ( x ) = \left\{ \begin{array} { l l } 4 & \text { if } x < 0 \\ - 4 x & \text { if } x \geq 0 \end{array} \right.$ ; Domain: $( \infty , 0 ) \cup \{ 4 \}$ , Range: $( \infty , \infty )$
C) $f ( x ) = \left\{ \begin{array} { l l } 4 & \text { if } x < 0 \\ x & \text { if } x \geq 0 \end{array} \right.$ ; Domain: $( \infty , 0 ] \cup ( 4 )$ , Range: $( \infty , \infty )$
D) $f ( x ) = \left\{ \begin{array} { l l } 4 & \text { if } x < 0 \\ - x & \text { if } x \geq 0 \end{array} \right.$ ; Domain: $( \infty , \infty )$ , Range: $( \infty , 0 ] \cup \{ 4 \}$

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