An electric charge $q$ is placed at the centre of a cube of side $a$. The electric flux through one of its faces will be
- A$\frac{q}{6\varepsilon_0}$
- B$\frac{q}{\varepsilon_0 a^2}$
- C$\frac{q}{4\pi \varepsilon_0 a^2}$
- D$\frac{q}{\varepsilon_0}$
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