Final answer:
Data encryption and two-factor authentication are measures used to enhance security. Single-factor authentication requires only one piece of evidence, while multi-factor authentication requires multiple proofs of identity. Biometric authentication relies on unique physical characteristics.
Step-by-step explanation:
Data encryption and two-factor authentication are measures used to enhance security. Data encryption involves converting sensitive data into unreadable code, which can only be accessed with the correct encryption key. Two-factor authentication requires users to provide two pieces of evidence to verify their identity, such as a password and a unique code sent to their phone. These measures help protect sensitive information and prevent unauthorized access.
Username id and password are examples of single-factor authentication, where only one piece of evidence is required to verify the user's identity. Biometric authentication, on the other hand, relies on unique physical characteristics, such as fingerprints or facial recognition, to authenticate individuals. This provides an additional layer of security.
Therefore, the correct answer to the question is Multi-factor authentication (B), as it encompasses both data encryption and two-factor authentication, which enhance security by requiring multiple proofs of identity.