Gum is found at the scene of a robbery - it may have been left by a thief! A fingerprint is made of saliva on gum, along with three suspects. None of these suspects DNA Fingerprints match the gum. Which of following is TRUE?
a. DNA fingerprints sometimes may change, so we can not rule out any suspects yet
b. the DNA fingerprints must have been done wrong
c. since the DNA fingerprint did not match any of suspects is the thief
d. since the DNA fingerprint did not match any suspect, none of these suspects left the gum