If ${\mathrm{N}}_{\mathrm{P}} \mathrm{and} {\mathrm{N}}_{\mathrm{e}}$ be the numbers  of holes and conduction electrons in an extrinsic semiconductor, then

• A

  ${\mathrm{N}}_{\mathrm{p}}> {\mathrm{N}}_{\mathrm{e}}$

• B

  ${\mathrm{N}}_{\mathrm{p}}= {\mathrm{N}}_{\mathrm{e}}$

• C

  ${\mathrm{N}}_{\mathrm{p}}< {\mathrm{N}}_{\mathrm{e}}$

• D

  ${\mathrm{N}}_{\mathrm{p}}> {\mathrm{N}}_{\mathrm{e}} \mathrm{or} {\mathrm{N}}_{\mathrm{p}}< {\mathrm{N}}_{\mathrm{e}}$ depending on the nature of impurity