If $B$ is the magnetic field and $q$ is the charge,then which of the following represents Gauss's law of magnetism?
- A$\oint \vec{B} \cdot d\vec{s} = 0$
- B$\oint \vec{B} \cdot d\vec{s} = q$
- C$\oint \vec{B} \cdot d\vec{s} = 4\pi$
- D$\oint \vec{B} \cdot d\vec{s} = \mu_0 q$
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