Allelic sequence variations where more than one variant (allele) at a locus in a human population with a frequency greater than $0.01$ is referred to as

Polymorphism in $DNA$ sequence

Which one of the following pairs of terms/names means one and the same thing?

Which technique is used to identify the binding of a radioactive probe with its complementary $DNA$ in a clone of cells?

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

The short repeating sequences of base pairs,which are used for $DNA$-profiling,are known as . . . . . . .