Transgenic animals are those which have foreign

Transgenic animals are produced for which of the following purposes?
$I$. To study the normal physiology and development
$II$. To study diseases
$III$. To obtain useful biological products
$IV$. To test the vaccine safety
$V$. To test the chemical safety
Which of the above statements are correct?

The name of the sheep which was cloned for the first time is:

Dolly the sheep was produced by:

Genetic engineering is useful for the production of?

$A$: Transgenic mice are being used to test the safety of the polio vaccine.
$R$: It could replace the use of monkeys to test the safety of batches of the vaccine.