The point of intersection of the curves $x^2 = y$ and $y^2 = x$ is

Question

$\begin{array}{1 1} (a)\; (0,0) (1,1) (-1,-1) \\ (b)\; (0,0) (-1,1)(-1,-1) \\(c)\; (0,0) (1,1) (-1,1) \\ (d)\; (0,0) (1,-1) (-1,-1) \end{array}$