The correct answer is:
(b) enrollment
Explanation: In biometric systems, the enrollment process refers to the phase where the biometric data of an individual (such as fingerprints, face scan, iris pattern, etc.) is captured and stored in a database for future identification or verification. During enrollment, the system captures the biometric trait, processes it, and stores the template in a secure system.
- Sampling refers to the process of capturing data, but it is typically part of the enrollment process.
- Admission usually refers to allowing access or entry based on biometric verification, not the capturing or storing of biometric data.
- Learning generally refers to the process of training or adapting systems, which is not directly related to the capturing or storing of biometric data.
Thus, enrollment is the correct term for capturing and storing biometric data.