What is the full form of $ADA$?

The first clinical gene therapy was given in $1990$ to a $4$-year-old girl with an enzyme deficiency of:

Which company first produced human insulin?

Which of the following is/are correct about Adenosine Deaminase $(ADA)$ deficiency?
$I$. In the absence of adenosine deaminase enzyme,purine metabolism is disturbed and $T$-lymphocytes fail to function.
$II$. $ADA$ deficiency is caused by the deletion of the gene for $ADA$.
$III$. In some cases,it can be cured by bone marrow transplantation and enzyme replacement therapy. But in both approaches,the patients are not completely cured.
$IV$. For permanent cure,genes isolated from the bone marrow cells producing $ADA$ at early embryonic stages can be a possible cure.
Which of the above statements are correct?

Which one of the following molecular diagnostic techniques is used to detect the presence of a pathogen in its early stage of infection?

Adenosine Deaminase $(ADA)$ deficiency can be cured by $\ldots A \ldots$ and $\ldots B \ldots$ but it is not fully curative. Here $A$ and $B$ can be