Which of the following defines a biometric characteristic?

A biometric characteristic is defined as an individual trait based on physiological characteristics. This means that biometric identifiers are unique, measurable biological traits that can be used to verify identity. Common examples include fingerprints, facial recognition, iris scans, and voice patterns. These traits are inherently associated with an individual, making them particularly useful for security purposes, access controls, and identity verification. Biometric systems leverage these unique physical attributes to ensure accuracy and reliability in identifying individuals, which enhances safety and security measures.

The focus on individual and physiological traits distinguishes biometric characteristics from methods of assessing population safety, general data collection processes, or legal frameworks surrounding digital evidence, which fall outside the scope of what defines biometrics specifically.