Identify the correct answer.

Dipole moment of $\displaystyle \mathrm{NF}_3$ is greater than that of $\displaystyle \mathrm{NH}_3$.

Three canonical forms can be drawn for $\displaystyle \mathrm{CO}_3^{2-}$ ion.

Three resonance structures can be drawn for ozone.

$\displaystyle \mathrm{BF}_3$ has non-zero dipole moment.