Where is the transcription unit found?

$RNA$ polymerase $II$ transcribes which type of $RNA$?

Which of the following statements about $RNA$ polymerase are correct?
$i. \;RNA\; \text{polymerase } I \text{ transcribes } rRNAs.$
$ii. \;RNA \; \text{polymerase } II \text{ transcribes } snRNAs.$
$iii. \;RNA \; \text{polymerase } III \text{ transcribes } hnRNA.$
$iv. \;RNA \; \text{polymerase } II \text{ transcribes } hnRNAs.$

Which $RNA$ is formed after the maturation of $hnRNA$?

Match the following columns:

Column-$I$	Column-$II$
$(a)$ Splicing	$(1)$ Contains only exons
$(b)$ Capping	$(2)$ Addition of adenylate residues
$(c)$ Tailing	$(3)$ Removal of introns
$(d)$ $mRNA$	$(4)$ Addition of methyl guanosine triphosphate

Removal of $RNA$ polymerase $III$ from nucleoplasm will affect the synthesis of