If the following represent Maxwell's field equations

A. \(∇ \times \bar {H}= \frac {\partial \bar{D}}{\partial t} + \bar{J}\)

B. \(∇ \times \bar{E} = \frac {\partial \bar{B}}{\partial t}\)

C. \(\nabla.\bar B = 0\)

D. \(\nabla.\bar D = \rho\)

then, _________