Which statement(s) is/are correct about dipole moment. 

$\text{ I. }1\text{ Debye is equivalent to }3.33\times {10}^{-30}\mathrm{Cm}\text{. }$

$\text{ II. }1\text{ Debye is equivalent to }{10}^{-18}\text{ esu. }$

$\text{ III. SI unit of dipole moment is coulomb meter }\left(\mathrm{Cm}\right)$

IV. Dipole moment of a molecule is useful to explain the shape of a molecule and also to predict other properties of the molecule.