How Is RNA Interference (RNAi)used as a Form of Gene

Multiple Choice

How is RNA interference (RNAi) used as a form of gene therapy?

A) Stem cells are removed from a patient,injected with large pieces of RNAi that carry the gene recipe for a particular enzyme,and returned to the body of the patient.
B) Large pieces of RNAi are directly injected into the damaged cells of a patient in order to deliver functional gene recipes.
C) Small pieces of RNAi are used to map the location of specific genes that need to be edited out of the genome.
D) Small pieces of RNAi are used to silence the expression of specific alleles.