The total number of 4 digit numbers in which the digits are in descending order is

• A

  _{${}^{\text{10}}{\text{C}}_{\text{4}}\text{ × 4!}$}

• B

  _{${}^{\text{10}}{\text{C}}_{\text{4}}$}

• C

  _{$\frac{\text{10!}}{\text{4!}}$}

• D

  _{$\text{1200}$}