9. Cells, when infected by a DNA virus, can transcribe both stands of the viral DNA and process it into ~21 nt single stranded fragments that can be loaded into protein complexes which target viral protein encoding transcripts for degradation. Which statement below correctly characterizes this process? (A) This siRNA silencing results in a gene knock out. (B) This siRNA silencing results in a gene knock down. (C) This miRNA silencing results in a gene knock out. (D) This miRNA silencing results in a gene knock down. (E) This miRNA silencing results in reversible gene regulation