The electric potential \(V\) in a region of space along the \(x\)-axis is given by the function \(V(x) = \alpha x^2\), where \(\alpha\) is a positive constant. The graph shows \(V\) as a function of position \(x\) over the interval \(-x_0 \le x \le x_0\). Which of the following graphs best represents the \(x\)-component of the electric field, \(E_x\), as a function of position \(x\) over the same interval?