In full-blown $AIDS$,which other diseases are likely to occur?

The full form of $AIDS$ is:

$AIDS$ is caused by which type of virus?

What is the cause of $AIDS$?

Identify the correct sequence for the mechanism of $HIV$ infection:
$1.$ Viral $RNA$ replicates to form viral $DNA$ with the help of reverse transcriptase.
$2.$ The progeny viruses released in the blood attack other $T_H$ cells and destroy them.
$3.$ Viral $DNA$ gets incorporated into the host cell's $DNA$ and produces virus particles.
$4.$ Virus enters into macrophages.

Which of the following statements is correct regarding $AIDS$?