Let $$f(x)=\begin{cases}\displaystyle{-x-4}&\text{if}\ x < 0\cr \displaystyle{\frac{2x}{1}}&\text{if}\ 0 \le x \le 3\cr \displaystyle{2}&\text{if}\ 3 < x\end{cases}.$$ Which of the following graphs is the graph of $f(x)$? ? A B C D

A		B
C		D

Hint: