The inward and outward electric flux from a closed surface are respectively 8 x 10³ and 4 x 10³ units.  Then the net charge inside the closed surface is

• A

  $\frac{-4\times {10}^3}{{\mathrm{\epsilon }}_0}\mathrm{coulomb}$

• B

  $-4\times {10}^3{\mathrm{\epsilon }}_0 \mathrm{coulomb}$

• C

  $\frac{4\times {10}^3}{{\mathrm{\epsilon }}_0} \mathrm{coulomb}$

• D

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