Facial recognition is identified through analysis of the neck up, the neck is not part of biometric facial recognition, therefore, the answer neck.
What is Facial recognition?
Facial recognition is a method of identifying or verifying a person's identity by using their face. People can be identified using facial recognition systems in photos, videos, or in real time.
Biometric security includes facial recognition. Voice recognition, fingerprint recognition, and retina or iris recognition are examples of biometric software. The technology is primarily used for security and law enforcement, but there is growing interest in other applications.
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