In terms of the order of acceptance, which of the following technologies is the LEAST accepted?

A.
Fingerprint

B.
Iris

C.
Handprint

D.
Retina patterns

Explanation:
The order of acceptance has slightly changed in the past years. It was Iris that was
the most accepted method three years ago but today we have Voice Pattern that is by far
the most accepted. Here is the list from most accepted first to least accepted at the
bottom of the list:
Voice Pattern
Keystroke pattern
Signature

Hand geometry
Handprint
Fingerprint
Iris
Retina pattern