Which of the following molecules have same bond order?

${\mathrm{H}}_2,{\mathrm{Cl}}_2,\mathrm{CO},{\mathrm{Br}}_2,{ \mathrm{N}}_2$

$\begin{array}{lll}\text{ I II III }& \text{ IV }& \text{ V }\end{array}$

Choose the correct option

In CO (three shared electron pairs between C and O) the bond order is 3. For ${\mathrm{N}}_2$, bond order is 3. ${\mathrm{H}}_2,{\mathrm{Cl}}_2$ and ${\mathrm{Br}}_2$ have bond order 1.