Which of the following is incorrect concerning RNAi?

A) Double-strand RNA is injected into a cell
B) A vector can be introduced to produce a double-stranded RNA hairpin
C) Fragments of the RNA anneal with a promoter and silence gene transcription
D) Fragments of the RNA anneal with the target mRNA.
E) The RiSC system degrades the target mRNA and the annealed RNA fragment.