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Resonance structure of a molecule should (i) Identical arrangements of atoms. (ii) nearly the same energy content. (iii) the same number of paired electrons. (iv) identical bonding

$(a)\;(i),(ii),and (iii) \\ (b)\;(i),(ii) and (iv) \\ (c)\;(ii),(iii)and (iv) \\ (d)\;(i) ,(iii) and (iv)$

The arrangement of atomic nuclei must be same in all the resonating structures and all of them must also contain the same number of paired electrons unpaired electrons.
Different resonating structures may differ in the way of distribution of electrons.
The energies of all of the resonating structures are almost same.
so (i) (ii)and (iii) are correct .
Hence a is the correct answer.