What is used in $DNA$ fingerprinting?

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

Give scientific reasons: $DNA$ polymorphism is the basis of genetic mapping of human genome.

The sensitivity of $DNA$ fingerprinting can be increased by the use of:

Which one of the following techniques has helped to solve many mysteries involving murders,robberies and rapes?

Polymorphism in $DNA$ sequence