Under which of the following conditions will there be no change in the reading frame of following mRNA?
5'AACAGCGGUGCUAUU3'
(1) Insertion of G at 5th position
(2) Deletion of G from 5th position
(3) Insertion of A and G at 4th and 5th positions respectively
(4) Deletion of GGU from 7th, 8th and 9th positions
