Consider these following sentences and choose the correct ones.
I. Each gene contains a specific promoter region and a leader sequence for guiding the beginning of transcription.
II. Only one strand of DNA, called template strand is copied by RNA polymerase, this strand runs in $3^{\prime }\to 5^{\prime }$ direction.
III. RNA polymerase adds complementary nucleotides forming single stranded mRNA in $3^{\prime }\to 5^{\prime }$ direction.
IV. Section of DNA that has been transcribed is rewound into its original configuration.

Two of the following statements are correctly defined. Identify the correct combination

i) Conversion of hnRNA to mRNA - processing

ii) Removal of introns and joining of exons - splicing

iii) Addition of adenylate residues to $3\text{'}$- end in a template dependent manner - Tailing

iv) Methyl adenosine triphosphate is added to $5\text{'}$ - end of hnRNA - capping

Match the animals of Column $\mathrm{I}$ with Column $\mathrm{II}$ and select the correct options among the following:

Select the code for the correct answer from the options given below.

In the given transcription unit, identify the regions $\mathrm{I}$ and $\mathrm{II}$ respectively. Coding strand