Which of the following Maxwell’s equation is valid for time varying conditions but not valid for static conditions:

Maxwell’s four equations describe the electric and magnetic fields arising from distributions of electric charges and currents, and how those fields change in time.

The equations are as follows:

$$\begin{gathered} \oint \overrightarrow{E}·d\overrightarrow{A}=\frac{q}{{\epsilon }_0} ...\left(1\right) \\ \oint \stackrel{\rightharpoonup }{B}·d\stackrel{\rightharpoonup }{A}=0 ...\left(2\right) \\ \oint \stackrel{\rightharpoonup }{E}·d\stackrel{\rightharpoonup }{l}=-\frac{\partial {\varphi }_B}{\partial t} ...\left(3\right) \\ \oint \stackrel{\rightharpoonup }{B}·d\stackrel{\rightharpoonup }{l}={\mu }_{0}I ...\left(4\right) \end{gathered}$$

From the above set of equations, it is clear that only the third equation is valid for time varying field.

Hence, this is the correct option.