Find the Domain and Range of the Function Graphed $( - \infty , \infty )$

Multiple Choice

Find the domain and range of the function graphed.
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A) domain: $( - \infty , \infty )$ ; range: $( - \infty , \infty )$
B) domain: $\left\{ \frac { 2 } { 3 } \right\}$ ; range: $( - \infty , \infty )$
C) domain: $\left\{ \frac { 2 } { 3 } \right\}$ ; range: $\{ 4 \}$
D) domain: $( - \infty , \infty )$ ; range: $\{ 4 \}$