19. Put the following steps of mRNA processing in correct order.
(1) Capping
(2) Polyadenylation
(3) Pre-mRNA cleavage
(4) Elongation of poly( A )
(5) RNA Splicing
(6) Transcription termination
(A) 1,2,3,4,5,6
(B) 1,5,3,2,4,6
(C) 6,1,2,4,3,5
(D) 6,3,1,2,4,5
(E) 3,6,1,2,4,5