Which of the following statements is correct regarding canonical forms of ${\text{CO}}_3^{2-}$ ion?

1. ${\text{CO}}_3^{2-}$ has resonance where the double bond is shared between the three C-O positions. This leads to 3 equivalent canonical forms. (Correct)2. ${\text{BF}}_3$ is trigonal planar and symmetrical, so $\mu =0$.3. ${\text{NH}}_3$ has a higher dipole moment than ${\text{NF}}_3$ because in ${\text{NH}}_3$, the bond moments and lone pair moment add up, while in ${\text{NF}}_3$, they partially oppose each other.4. Ozone (${\text{O}}_3$) has 2 main resonance structures.