Which of the following is a common method of biometric authentication?

Fingerprint verification is considered a common method of biometric authentication because it relies on the unique patterns present in an individual's fingerprints. Each person has distinct ridge patterns and minutiae that can be captured and analyzed by biometric sensors. This method offers a high level of security, as the likelihood of two people having the same fingerprint is extremely low.

Biometric authentication systems, such as those using fingerprint verification, provide a more personalized and secure approach compared to traditional authentication methods like passwords, which can be forgotten, stolen, or easily guessed. Unlike security questions, which may rely on information that could be publicly available or easily accessible, or Captcha responses that serve mainly to differentiate between human and automated access, fingerprint verification offers a robust solution based on physical characteristics unique to each user.