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

Which of the following statements are correctly related to the given diagram of transcription?
$(a)$ $A$ is the Coding strand
$(b)$ $A$ is the Non-coding strand
$(c)$ $B$ is the Antisense strand
$(d)$ $B$ is the Sense strand

Compare the statements $A$ and $B$.
$Statement A$: $RNA$ produced during transcription in eukaryotic cells cannot be straight away used in translation.
$Statement B$: $RNA$ splicing phenomena helps in the removal of exons.
Choose the correct description.

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

Choose the correct statement.

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