Which of the following statements about $RNA$ polymerase are correct?

$i. \;RNA\; polymerase \;I \;transcribes \;rRNAs$.

$ii. \;RNA \;polymerase \;II \;transcribes \;snRNAs.$

$iii. \;RNA \;polymerase \;III \;transcribes \;hnRNA.$

$iv. \;RNA \;polymerase \;II \;transcribes \;hnRNAs.$

Which of the following $RNAs$ is not required for the synthesis of protein?

Which of the following is nongenetic, which is utilised for protein synthesis

Which one process is only concerned with the transcription

Select the correct option:

Direction of $RNA$                 Direction of reading of
  synthesis                                the template $DNA$ strand

Which enzyme plays important role in transcription