Which one of the following is Permament cure of Adenosine Deaminase (ADA) deficiency is :
| A. |
enzyme replacement therapy |
| B. |
introducing isolated gene from marrow cells producing ADA into the cells at early embryonic stages |
 |
| C. |
injecting the functional ADA, CDNA into the patient |
| D. |
administering adenosine deaminase through injections |