Which one of the following pairs of molecules will have permanent dipole-moments for both members?

${\mathrm{SiF}}_4,{\mathrm{CO}}_2$ are perfectly symmetrical molecules.
Here, the dipole in every direction cancels out, leaving no residual dipole.
Resonance takes place in both ${\mathrm{NO}}_2$ and ${\mathrm{O}}_3$.
Both molecules' partial charges result in separate dipoles, which in turn produce a persistent dipole moment.