A charge Q is situated at the centre of a cube. The electric flux through one of the faces of the cube is :

• A

  $\left(\mathrm{Q}/{\mathrm{\epsilon }}_0\right)$

• B

  $\left(\mathrm{Q}/2{\mathrm{\epsilon }}_0\right)$

• C

  $\left(\mathrm{Q}/4{\mathrm{\epsilon }}_0\right)$

• D

  $\left(\mathrm{Q}/6{\mathrm{\epsilon }}_0\right)$