There are four species ${\mathrm{CO}}_2, {\mathrm{N}}_3^{\ominus }, {\mathrm{NO}}_2^{\oplus }\text{ and }{\mathrm{I}}_3^{\ominus }$ . Which of the following statement is correct about these species?

All are linear but only ${\mathrm{CO}}_2,{\mathrm{N}}_3^{\ominus }\text{ and }{\mathrm{I}}_3^{⊝}$ have sp hybridisation on their central atom

All are linear but only ${\mathrm{CO}}_2,{\mathrm{N}}_3^{\ominus }\text{ and }\stackrel{\oplus }{{\mathrm{NO}}_2}$ have sp hybridisation on their central atom.

All are linear and having sp hybridisation of central atoms.

${\mathrm{CO}}_2,{\mathrm{N}}_3^{\ominus }\text{ and }{\mathrm{NO}}_2^{\oplus }$ are linear but ${\mathrm{I}}_3^{\ominus }$ is not.