$ELISA$ system is based on which of the following principles?

Which therapy can be used to treat the genetic disorder $S.C.I.D.$?

In which of the following microorganisms can vaccines be produced using recombinant $DNA$ technology?

The term $Humulin$ is used for:

Genetically engineered human insulin is prepared by using:

Consider the following statements about therapeutic drugs:
$I$. The recombinant $DNA$ technology is used for the production of therapeutic drugs which are safe and effective.
$II$. It avoids unwanted immunological responses,commonly observed with similar products isolated from non-human sources.
$III$. About $30$ recombinant therapeutics have been approved for human use in the world,including India.
Which of the statements given above are correct?