Identify the correct set of labels for the given diagram of a transcription unit.

Which of the following is not a part of a transcription unit?

During transcription,the holoenzyme $RNA$ polymerase binds to the $DNA$ strand,and the $DNA$ forms a saddle-like structure at that site. What is this sequence called?

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

Match Column-$I$ with Column-$II$ and select the correct answer from the options given below.

Column-$I$	Column-$II$
$i$. Cistron	$a$. Addition of methylated $GTP$ to $5'$-end of $hnRNA$.
$ii$. Exon	$b$. Non-coding sequences which are removed by splicing.
$iii$. Intron	$c$. Segment of $DNA$ coding for a polypeptide.
$iv$. Capping	$d$. Coding sequences which appear in processed $mRNA$.

Given below are two statements, one is labelled Assertion $(A)$ and the other is labelled as Reason $(R)$.
Assertion $(A) :$ In eukaryotes, primary transcripts $(hnRNA)$ contain both exons and introns, and introns are non-functional.
Reason $(R) :$ In bacteria, the $mRNA$ does not require any processing, and transcription and translation take place in the same compartment.
In the light of the above statements, choose the most appropriate answer from the options given below $:$