Which of the following biometrics will MOST likely be used, without the need for enrollment?

An organization is developing an authentication service for use at the entry and exit ports of country borders. The service will use data feeds obtained from passport systems, passenger manifests, and high-definition video feeds from CCTV systems that are located at the ports. The service will incorporate machine-learning techniques to eliminate biometric enrollment processes while still allowing authorities to identify passengers with increasing accuracy over time. The more frequently passengers travel, the more accurately the service will identify them .

Which of the following biometrics will MOST likely be used, without the need for enrollment? (Choose two.)
A . Voice
B . Gait
C . Vein
D . Facial
E . Retina
F . Fingerprint

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Answer: B,D