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(D) The displacement current $i_d$ is defined as $i_d = \epsilon_0 \frac{d\phi_E}{dt}$,where $\phi_E$ is the electric flux between the plates.Since th

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Both $A$ and $B$.

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(D) The displacement current $i_d$ is defined as $i_d = \epsilon_0 \frac{d\phi_E}{dt}$,where $\phi_E$ is the electric flux between the plates.Since the electric flux $\phi_E = \frac{q}{\epsilon_0}$,we have $i_d = \frac{dq}{dt}$.This means that the displacement current exists whenever the charge $q$ on the capacitor plates is changing with time.Therefore,the charge on the capacitor is either increasing (during charging) or decreasing (during discharging).Thus,both $A$ and $B$ are correct.

When a displacement current $i_d$ flows in the region between the two plates of a capacitor,the charge on the capacitor is:

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