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
| 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 |
- A$a-3, b-4, c-2, d-1$
- B$a-4, b-2, c-1, d-3$
- C$a-3, b-2, c-1, d-4$
- D$a-3, b-4, c-1, d-2$
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