A patient has severe combined immunodeficiency. Which best explains why the patient cannot benefit from immunizations to treat the disease?

Immunizations are used to provoke genetic immunity, so they will not work for acquired diseases.
Immunizations are used to provoke acquired immunity, so they will not work for genetic diseases.
Immunizations are used to treat retroviruses, and severe combined immunodeficiency is a cancer.
Immunizations are used to treat cancers, and severe combined immunodeficiency is a retrovirus.