The below figure shows the graph of $y=f(x)$. Which of the following could be the $f(x)$.

Question

$\begin{array}{1 1} (a)\;f(x)=-\frac{1}{2}x+2\\(b)\; f(x)=\frac{1}{2}x-2\\(c)\;f(x)=\frac{-1}{2} x-2\\ (d)\;f(x)= \frac{1}{2}x+2\end{array}$