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The correct answer is B.

OBJ-4.1: Retina scans are considered a biometric control. Other biometric controls contain fingerprint readers and facial scanners. A cipher lock is a lock that is opened with a programmable keypad that is used to limit and control access to a highly sensitive area. An optical reader is a device found within most computer scanners that can capture visual information and translate the image into digital information the computer is capable of understanding and displaying. Multi-factor authentication is an electronic authentication method in which a user is granted access to a website or application only after successfully presenting two or more pieces of evidence to an authentication mechanism: knowledge, possession, and inherence.

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