How many adenylate residues are added in the process of tailing?

In the processing of $hnRNA$ in eukaryotic cells,the primary transcripts are processed in the following sequence.

In eukaryotes,$RNA$ polymerase $III$ catalyses the synthesis of

Which of the following is $NOT$ a function of $RNA$ polymerase?

Which of the following statements are correct?
$i. r-RNA$ provides the template for synthesis of proteins.
$ii. t-RNA$ brings amino acids and reads the genetic code.
$iii. RNA$ polymerase binds to promoter and initiates transcription.
$iv. A$ segment of $DNA$ coding for a polypeptide is called an intron.

$RNA$ processing is: