Which is an example of how latent evidence can be used to solve a crime?

a hidden fingerprint on a murder weapon did not match that of the suspect.

clearly visible fingerprints on a knife are matched to a suspect.

a forensic scientist concludes that tiny hairs found on a murder victim were not those of a suspect, but rather those of a dachshund.

the coagulation of blood near a victim indicates that death occurred two hours prior to discovery, when a suspect was reported at work.