Which of the following statement is / are correct ?

The CO₂ molecule behaves as non-polar molecule even though two of its resonating structures .$\overline{\mathrm{O}}-\mathrm{C}\equiv {\mathrm{O}}^{+}\text{and }{\mathrm{O}}^{+}\equiv \mathrm{C}-\overline{\mathrm{O}}$ are dipolar.

The carbon atom is sp² hybridized in the CO₂ molecule as well as its hydrate H₂CO₃ 

The CO2 molecule is linear because the carbon atom utilizes its sp orbitals to form $\mathrm{\sigma }$ bonds

Carbon dioxide is the anhydride of the unstable dibasic acid O = C(OH)₂