Select one of these biometric techniques and explain the benefits and the vulnerabilities associated with that method in 3-4 paragraphs.

Some common biometric techniques include:

1. Fingerprint recognition
2. Signature dynamics
3. Iris scanning
4. Retina scanning
5. Voice prints
6. Face recognition

Select one of these biometric techniques and explain the benefits and the  vulnerabilities associated with that method in 3-4 paragraphs.