Ex Vivo Gene Therapy Differs from in Vivo Gene Therapy

Ex vivo gene therapy differs from in vivo gene therapy in that

A) ex vivo gene therapy involves directly introducing the gene into the body.
B) in vivo gene therapy involves directly introducing the gene into the body.
C) in vivo gene therapy only employs viruses for gene transfer.
D) ex vivo gene therapy only employs viruses for gene transfer.
E) ex vivo gene therapy can employ viruses, nasal sprays, or liposomes for gene transfer, but only liposomes may be used for in vivo gene therapy.