Which of the following statements are true about the roles of RNA polymerase subunits?

[answerhappygod]

i. α subunit is encoded by “rpo A” gene, required for core protein assembly.
ii. β subunit is encoded by “rpo C” gene is the catalytic center of RNA polymerase.
iii. ω subunit is encoded by “rpo Z” gene and helps in proper association of all the subunits.
iv. σ factor is encoded by “rpo D” gene and contributes in promoter recognition.
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a) i, ii, iii
b) ii, iii, iv
c) i, iii, iv
d) i, ii, iii, iv