An object of mass \(m\) is attached to an ideal spring and undergoes simple harmonic motion along the \(x\)-axis with amplitude \(x_0\) and angular frequency \(\omega\). The net acceleration of the object at any position \(x\) is given by \(a(x) = -\omega^2 x\). Which of the following best describes the shape of the graph of the object's velocity \(v\) as a function of position \(x\) over one full cycle of oscillation?