Which of the following statements correctly describes transfection gene therapy?

transfection gene therapy exposes host cells to dna with a healthy gene in a laboratory and is meant to negatively affect the host.
transfection gene therapy inserts a healthy gene into a host thru a virus that is meant to negatively affect the host.
transfection gene therapy exposes host cells to dna with a healthy gene in a laboratory and is meant to positively affect the host.
transfection gene therapy inserts a healthy gene into a host thru a virus that is meant to positively affect the host.