Explanation/Reference:
Explanation: Biometrics is a method of authentication that uses physical characteristics, such as fingerprints, scars, retinal patterns, and other forms of biophysical qualities to identify a user. Nowadays, the usage of biometric devices such as hand scanners and retinal scanners is becoming more common in the business environment. It is the most secure method of authentication. AnswerB is incorrect.
Username and password is the least secure method of authentication in comparison of smart card and biometrics authentication. Username and password can be intercepted. AnswerD is incorrect. Smart card authentication is not as reliable as biometrics authentication. Answer: C is incorrect. Anonymous authentication does not provide security as a user can log on to the system anonymously and he is not prompted for credentials.