Each Individual's Voice Is Unique, Similar to Fingerprints, and This

Multiple Choice

Each individual's voice is unique, similar to fingerprints, and this can now be used for identification purposes. This technology is new, and it is becoming more and more reliable. What concept does this refer to?

A) Aspects of "Voice Typing."
B) Major vocal areas that influence stereotypes.
C) Subjective measures of the ideal voice for attractiveness.
D) Qualities an ideal speaker seems to have.
E) None of the above.