Unpolarized light of initial intensity \(I_0\) travels along the \(x\)-axis and passes through three ideal polarizing filters arranged sequentially. The first filter has a vertical transmission axis (\(\theta_1 = 0^\circ\)). The second filter has its transmission axis oriented at an angle \(\theta\) relative to the vertical, where \(0^\circ < \theta < 90^\circ\). The third filter has a horizontal transmission axis (\(\theta_3 = 90^\circ\)). Which of the following expressions correctly gives the intensity \(I\) of the light emerging from the third filter?