Choose the correct statements among the following

• A

  A node is a point in space where the wave-function $\psi$ has zero amplitude

• B

  The number of maxima (peaks) in radial probability distribution function is $\left(n-\mathcal{l}\right)$ 

• C

  Radial probability density is $4\mathrm{\pi r}{.}^{ }{{\mathrm{R}}_{\mathrm{n},}^2}_{\mathcal{l}}\left(\mathrm{r}\right)$

• D

  ${\mathrm{\psi }}^2$ represents probability of finding electron