Which one of the following species has plane triangular shape?

1. ${\text{CO}}_2$: $sp$ hybridized, Linear.2. ${\text{N}}_3^{-}$: Linear.3. ${\text{NO}}_2^{-}$: $s{p}^2$ hybridized with one lone pair, V-shaped/Bent.4. ${\text{NO}}_3^{-}$: Central $N$ atom has 3 bond pairs and 0 lone pairs. Hybridization is $s{p}^2$, and the shape is trigonal planar (plane triangular).