What is the basis of $DNA$ fingerprinting?

In density gradient centrifugation,bulk $DNA$ forms a/an ......,while satellite $DNA$ forms a/an ...... .

Assertion : $DNA$ fingerprinting has become a powerful tool to establish paternity and identity of criminals in rape and assault cases.
Reason : Trace evidences such as hairs,saliva,and dried semen are adequate for $DNA$ analysis.

During $DNA$ fingerprinting,the $ds$-$DNA$ splits into $ss$-$DNA$ by . . . . . . treatment.

Which of the following is used in the $DNA$ fingerprinting technique?

Some of the steps of $DNA$ fingerprinting are given below. Identify the correct sequence from the options given.
$A$. Electrophoresis of $DNA$ fragments
$B$. Hybridisation with $DNA$ probe
$C$. Digestion of $DNA$ by $RENS$
$D$. Autoradiography
$E$. Blotting of $DNA$ fragments to nitrocellulose membrane