The inward and outward electric flux for a closed surface in units of N-${\mathrm{m}}^2$/C are respectively $8 \times {10}^3$ and $4 \times {10}^3$. Then the total charge inside the surface is (where ${\mathrm{\epsilon }}_{\mathrm{o}}$ = permittivity constant)

• A

  $4\times {10}^3\mathrm{C}$

• B

  $-4\times {10}^3\mathrm{C}$

• C

  $\frac{-\left(4\times {10}^3\right)}{{\mathrm{\epsilon }}_{\mathrm{o}}}\mathrm{C}$

• D

  $-4\times {10}^3{\mathrm{\epsilon }}_{\mathrm{o}}\mathrm{C}$