Which of the Following Statements Are True About STRs (Short

Which of the following statements are true about STRs (Short Tandem Repeats) ? (Select all that apply)

A) 15 different regions in the human genome show significant STR variation from one individual to another.
B) STRs are DNA sections in which 2-5 base-pair sequences are repeated in tandem units several to dozens of times.
C) A DNA profile is found by combining the probability of having specific combinations of STRs at different sites.
D) Each individual has dozens of different STRs at a specific site on a chromosome.