If q  is the charge per unit area on the surface of a conductor, then the electric field intensity at a point on the surface is 

• A

  $\left(\frac{\mathrm{q}}{{\mathrm{\epsilon }}_0}\right)$ normal to surface

• B

  $\left(\frac{\mathrm{q}}{2{\mathrm{\epsilon }}_0}\right)$ normal to surface

• C

  $\left(\frac{\mathrm{q}}{{\mathrm{\epsilon }}_0}\right)$ tangential to surface

• D

  $\left(\frac{\mathrm{q}}{2{\mathrm{\epsilon }}_0}\right)$ tangential to surface