The correct statements among the following

In gaseous SO₃, sulphur is in sp² hybridization.

In ß and $\mathrm{\gamma }$ SO₃ sulphur is in sp³ hybridization

In cyclic isomer of SO₃ all S–O bond lengths are equal

In cyclic isomer of SO₃ the number of $\mathrm{\sigma }$ S - O bonds are equal both with in the ring and out side the ring