A parallel plate capacitor with plate area $A$ and separation $d$ between the plates is charged by a constant current $i$. Consider a plane surface of area $A/4$ parallel to the plates and drawn symmetrically between the plates. Calculate the displacement current through this area.

Question

$\begin {array} {1 1} (a)\;i/4 & \quad (b)\;i \\ (c)\;i/2 & \quad (d)\;i/3 \end {array}$