Which of the following is the dimension of the coefficient of friction?

• A

  $\left[M^2{L}^{2}T\right]$

• B

  $\left[{\mathrm{M}}^0{ \mathrm{L}}^0{ \mathrm{T}}^0\right]$

• C

  $\left[{\mathrm{ML}}^2{ \mathrm{T}}^{-2}\right]$

• D

  $\left[{\mathrm{M}}^2{ \mathrm{L}}^2{ \mathrm{T}}^{-2}\right]$