Techniques for forensic genetic fingerprinting, such as the FBI's CODIS system, rely on each of the following EXCEPT one. Which is the exception?

a. Every individual in a population having a different genotype at a single short tandem repeat locus.
b. Independent assortment of multiple, highly polymorphic loci at meiosis.
c. The ability to amplify specific short tandem repeat (STR) loci with primers complementary to flanking unique sequences.
d. The tendency of differences in simple sequence repeats to arise by replication errors.