Which of the following is the LEAST user accepted biometric device?

Which of the following is the LEAST user accepted biometric device?
A .  Fingerprint
B .  Iris scan
C .  Retina scan
D .  Voice verification

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Answer: C

Explanation: The biometric device that is least user accepted is the retina scan, where a system scans the blood-vessel pattern on the backside of the eyeball. When using this device, an individual has to place their eye up to a device, and may require a puff of air to be blown into the eye. The iris scan only needs for an individual to glance at a camera that could be placed above a door. Source: HARRIS, Shon, All-In-One CISSP Certification Exam Guide, McGraw-Hill/Osborne, 2002, Chapter 4: Access Control (page 131).