DNA sample collected from the scene of a crime is believed to be from the perpetrator. It is genotyped for four SSR loci. Four suspects are genotyped as well. All five genotypes are shown below as fluorometric traces, with the colors corresponding to different loci.

(a) Which individuals can be excluded as suspects and why?

(b) Which of the individuals could be the perpetrator? Do you think the evidence is conclusive? Why or why not?