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Which of these is not a type of biometric system that can be used to identify a person?
handprints
voice print
Kerberos
retinal scan
There is no 'feet print' biometric system, it is a made-up system. All others are valid biometric systems.
[No one's created a footprint scanner because it would be inconvenient and intrusive to use. Someone COULD create it, though, so it IS a type of biometric system that can be used to identify a person (and would be more accurate than a voice print). Better to change the question to "which of these is not a practical biometric system?" or provide an answer that CAN'T be a type of biometric system.] EDIT: Looks like someone changed it to Kerberos, a perfectly reasonable answer.
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