A light beam consisting of a mixture of unpolarized light of intensity \(I_u\) and linearly polarized light of intensity \(I_p\) is incident normally on a linear polarizer. As the polarizer is rotated through \(360^\circ\) about an axis parallel to the beam's direction of propagation, the transmitted intensity varies between a minimum value \(I_{\text{min}}\) and a maximum value \(I_{\text{max}}\). In terms of \(I_u\) and \(I_p\), which of the following expressions represents the ratio \(\dfrac{I_{\text{min}}}{I_{\text{max}}}\)?