Which of the following works on the principle of the method developed by Frederick Sanger?

$DNA$ fingerprinting using Variable Number Tandem Repeats $(VNTRs)$ is based on the observation that

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?

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

Probes,used in $DNA$ fingerprinting,are initially

What is it that forms the basis of $DNA$ fingerprinting?