Statement-I : For natural polymers PDI value is  always equal  to unity.

Statement-II : The ratio  of ${\overline{\mathrm{M}}}_{\mathrm{w}}$ and  ${\overline{\mathrm{M}}}_{\mathrm{n}}$ of a polymer  is called PDI.

Statement I is correct but statement II is incorrect

Statement I is incorrect but statement II is correct

Both statements I and II are incorrect.

Both statements I and II are correct.