$AIDS$ is caused by which type of virus?

$AIDS$ causing factors are associated with

Which of the following is commonly used nowadays for the detection of $HIV$ in a potential $AIDS$ patient?

Which of the following is considered the factory for $HIV$?

The World Health Organization has started a number of programmes to prevent the spreading of $HIV$ infection.
Few such steps include:
$I.$ Ensuring the use of disposable needles and syringes.
$II.$ Free distribution of condoms.
$III.$ Advocating safe sex.
$IV.$ Controlling drug abuse.
Which of the steps given above are correct?

The $AIDS$ virus has: