Which biometric characteristic is generally regarded as the most stable over a person's lifetime, making it well-suited for long-term physical access control authentication?
Facial appearance
Iris pattern
Voice pitch and cadence
Handwritten signature dynamics
Iris patterns form in early childhood and remain essentially unchanged throughout a person's life, which makes iris recognition reliable for long-term identity verification in physical access control systems. In contrast, voice characteristics can vary due to illness, age, or emotional state; handwritten signature dynamics often change with fatigue or stress; and facial appearance can alter with aging, weight change, facial hair, or cosmetic surgery.
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