Displacement current $\left(i_d\right)=\frac{\varepsilon_o d \phi_E}{d t}$.

Where symbols have their usual meanings.

Which of the following options gives correct equation for displacement current?

$i_d=A \varepsilon_o \frac{d E}{d t}$

$ i_d = \epsilon_0 \frac{d\phi_E}{dt} = \epsilon_0 \frac{d(EA)}{dt} = \epsilon_0 A\frac{dE}{dt}$