Which of the following statements are correct regarding transcription?

(i) rRNAs plays structural and catalytic role during translation.

(ii) There is single DNA-dependent RNA polymerase that catalysis transcription of all types as RNA in bacteria.

(iii) RNA polymerases able to catalyze all the three steps of transcription i.e., initiation, elongation and termination.

(iv) The RNA polymerase is only capable of catalyzing the process of elongation.

(v) Many times the translation can begin much before the mRNA is fully transcribed in bacteria, so transcription and translation can be coupled in bacteria.

(vi) In eukaryotes, the primary transcripts called hnRNa contain both the exons and the introns and are non-functional.