The authentication classification method of Personal Characteristic is most closely described as a:

The correct answer is letter "C": Fingerprint, voiceprint, signature, or hand size.

Explanation:

Different financial and governmental institutions requests individuals enrolled to authenticate themselves so their records will not be confused with someone else's. For that purpose, the authentication classification method of Personal Characteristics takes the individual's fingerprint, voiceprint, and signature. In correction centers, even the hand size is necessary as long as some other inmate special features - tattoos, for instance, so that person's information can be shared with some other bureaus, if necessary.