The correct answer is Biometrics.

Biometrics refers to authentication techniques that rely on unique physical or physiological traits of a person. Fingerprint scans retinal scans and iris scans are classic biometric modalities used to confirm the identity of someone requesting access to systems or data.

Physiometrics is not the standard term used in information security. The accepted and widely used term for fingerprint retinal and iris based verification is biometrics.

Behavioral biometrics focuses on patterns of behavior such as typing rhythm gait or mouse movement. Those behavioral methods do not describe physical scans like fingerprints or iris scans so this option is incorrect.

Micrometrics is not a recognized term for human identity verification by biological traits and it does not refer to fingerprint retinal or iris scanning. That makes it incorrect for this question.

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