Which of the following modifications are necessary for most eukaryotic RNA processing ?
(i) addition of modified nucleotide at the 5' terminal
(ii) cleavage of long precursor RNA into smaller one
(iii) formylation of bases at 3' poly (A) tail
(iv) alteration of incorrect bases through proof reading
Select the correct answer using the codes give below `:`

Options

A. (i) and (ii)
B. (ii) and (iii)
C. (i) and (iv)
D. (ii) and (iv)

Answer

A