If $\mathrm{f} : \mathrm{A}\to \mathrm{B}$ is a bijective function, then $f^{-1}of$ is equal to 

• A

  ${\mathrm{fof}}^{-1}$

• B

  f

• C

  $f^{-1}$

• D

  I_A (the identity map of the set A)