The dimensional formula of Planck's constant is

Options

1. A$\left[\mathrm{ML}^2 \mathrm{~T}^{-1}\right]$
2. B$\left[\mathrm{ML}^2 \mathrm{~T}^{-2}\right]$
3. C$\left[\mathrm{ML}^0 \mathrm{~T}^2\right]$
4. D$\left[\mathrm{MLT}^2\right]$