In biometric identification systems, at the beginning, it was soon apparent that truly positive
identification could only be based on physical attributes of a person. This raised the necessicity of
answering 2 questions:

A.
What was the sex of a person and his age

B.
what part of body to be used and how to accomplish identification to be viable

C.
what was the age of a person and his income level

D.
what was the tone of the voice of a person and his habits