The charge on a parallel plate capacitor varies as $q= q_0 \cos 2 \pi \gamma t$ The plates are very large and close together (area aa , separation =d) Neglecting the edge effects, find the displacement current through the capacitor ?

Question

$\begin{array}{1 1} (a)\; q_{_0} 2\pi \gamma \sin 2 \pi \gamma t \\(b)\; -q_{_0} 2\pi \gamma \sin 2 \pi \gamma t \\ (c)\;q_{_0} 2\pi \gamma \cos 2 \pi \gamma t \\(d)\; -q_{_0} 2\pi \gamma \cos 2 \pi \gamma t \end{array} $