(A) Protein encoded by gene ‘Y’ is not lethal to the cell.
(B) Gene ‘X’ has introns, which prevents its expression in E coli.
(C) Expression of ‘X’ protein is lethal to the cell.
(D) The ‘Y’ gene product inhibits the activity of ‘X’ protein.
Which one of the following options represents a combination of correct statements to explain the observations ?