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

In $DNA$ fingerprinting,which of the following is true?

Repetitive sequences are stretches of $DNA$ with repeated bases many times in a genome, but
$(a)$ These sequences are of no transcriptional function
$(b)$ These are associated with euchromatin region
$(c)$ These help to identify a person on the basis of their $DNA$ specificity

What is the size range of $VNTR$?

In the recent past,human chromosomes have been studied by a technique using specific,often fluorescent dyes,known as

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