Kirchhoff's current law for direct currents is implicit

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Kirchhoff's current law for direct currents is implicit in the expression—

1. ∇ · D = ρ
2. ∫ J · n ds = 0
3. ∇ · B = 0
4. ∇ × H = J + ∂ D/∂t

Correct Option: B

∫_s J.ds implies that the net current coming out of a closed surface is zero; which is the KCL for direct current.