During enrollment, the scanner sends ________ to the authentication system.

• A. scan data
• B. Both A and B
• C. Neither A nor B
• D. key features

Answer: (D)

In biometric enrollment, the goal is to create a stable, compact representation of a person’s biometric data that can be used for quick and reliable matching later. The scanner captures the biometric sample and the system extracts its distinctive features—these are the key features, often stored as a biometric template. That template is what’s sent to the authentication system and stored for future comparisons. Raw scan data would be large, noisy, and harder to match consistently, so it’s the feature-based representation that’s transmitted and kept. This makes recognition faster, more privacy-preserving, and more robust to small variations in the input.