Final answer:
Biometric authentication provides the highest level of security.
Step-by-step explanation:
In terms of security, biometric authentication provides the highest level of security among the options given. This is because biometric authentication uses unique physical or behavioral characteristics, such as fingerprints or facial recognition, to verify a person's identity. These characteristics are difficult to fake or replicate, making biometric authentication more secure than passwords, PINs, or security questions.