Consider the following statement regarding probability density,

I. It is denoted by $|\mathrm{\psi }{|}^2$.

II. It is the probability of finding an electron at a point within an atom is proportional to the square of the orbital wave function.

III. From the value of $|\mathrm{\psi }{|}^2$ at different points, within an atom, it is possible to predict the region around the nucleus where electron will most probably be found.

Choose the correct option.