Automated $DNA$ sequencers work on the principle of the method developed by

Select the appropriate option for $DNA$ fingerprinting.

Read the following statements:
$A.$ Variation at genetic level arises due to mutations.
$B.$ The technique of $DNA$ fingerprinting was initially developed by Alec Jeffreys.

Given below are two statements.
Statement $I$ - In the population,every person shows unusual sequences of $20-100$ base pairs,which are repeated several times and are termed as $VNTRs$.
Statement $II$ - $VNTRs$ are same in each individual and hence is the key factor in $DNA$ profiling.
In the light of above statements,select the correct option given below:

Matching sequence of $DNA$ between two evidences,one of the criminal with the suspect is known as:

Satellite $DNA$ is a useful tool in: