$O_2$ molecules consists of two oxygen atoms. In the molecule , nuclear force between the nuclei of the two atoms

Question

$\begin{array}{1 1} \text{is not important because nuclear forces are short - ranged } \\ \text{is as important as electro static force for binding the two atoms } \\\text{Cancels the repulsive electro static force between the nucli} \\ \text{ is not important because oxygen nucleus have equal number of neutron and protons } \end{array}$