A point charge Q is placed at the centre of a cube, another point charge Q is placed at one edge of the cube and a third charge is placed at one corner of the cube. Then the net electric flux over the entire surface of the cube is

• A

  $\raisebox{1ex}{$\mathrm{Q}$}\!\left/ \!\raisebox{-1ex}{${\in }_{\mathrm{o}}$}\right.$

• B

  $\raisebox{1ex}{$3\mathrm{Q}$}\!\left/ \!\raisebox{-1ex}{$8{\in }_{\mathrm{o}}$}\right.$

• C

  $\raisebox{1ex}{$11\mathrm{Q}$}\!\left/ \!\raisebox{-1ex}{$8{\in }_{\mathrm{o}}$}\right.$

• D

  $\raisebox{1ex}{$9\mathrm{Q}$}\!\left/ \!\raisebox{-1ex}{$8{\in }_{\mathrm{o}}$}\right.$