If $A=\{-1,0,1\}$ and $f:A\rightarrow A$ is defined as $f(x)=x^2$, then what type of function is $f$ ?

Question

$\begin{array}{1 1} 1-1 \;function \\ onto\;function \\ both 1-1\;and\;onto \\ neither \;1-1\;nor\;onto \end{array}$