An ideal parallel-plate capacitor with plate separation distance \(d\) carries charge \(+Q\) on its top plate and charge \(-Q\) on its bottom plate. Three points, \(P_1\), \(P_2\), and \(P_3\), are located between the plates along a central vertical line at distances of \(0.2d\), \(0.5d\), and \(0.8d\) below the top plate, respectively. Neglecting fringe effects, which of the following correctly ranks the electric field energy density \(u\) at points \(P_1\), \(P_2\), and \(P_3\)?