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

What is $DNA$ fingerprinting?

Blood stains are found at the site of a murder. If $DNA$ profiling technique is to be used for identifying the criminal,which of the following is ideal for use?

Arrange the various steps of $DNA$ fingerprinting technique in the correct order.
$(I)$ Separation of $DNA$ fragment by electrophoresis.
$(II)$ Digestion of $DNA$ by restriction endonucleases.
$(III)$ Hybridization using labeled $VNTR$ probe.
$(IV)$ Isolation of $DNA$.
$(V)$ Detection of hybridized $DNA$ fragments by autoradiography.
$(VI)$ Transferring of separated $DNA$ fragment to synthetic membranes.

$A$: Unknown $DNA$ after hybridization with $VNTR$ probe,the autoradiogram gives many bands of differing sizes in $DNA$ profiling.
$R$: These bands represent the $DNA$ fingerprint of the organism.

What is the basis of $DNA$ fingerprinting?