An authentication scheme that requires the user to present at least two different factors; for example, something you know, something you have, something you are, something you do, and somewhere you are. Specifying two factors is known as "2FA."

An authentication scheme that requires the user to present at least two different factors; for example, something you know, something you have, something you are, something you do, and somewhere you are. Specifying two factors is known as "2FA."

• A. password manager
• B. tokenization
• C. steganography
• D. multifactor authentication (MFA)

Answer: (D)

Using multiple factors to authenticate strengthens verification by requiring independent credential types. Multifactor authentication covers any scenario with two or more factors, making it the general term for this approach. Two-factor authentication is a specific case of MFA where exactly two factors are used, but MFA remains the broader concept that can include more than two factors (for example, adding a biometric and a hardware token on top of a password). The other options don’t describe an authentication scheme: a password manager stores and autofills passwords, tokenization replaces data with tokens, and steganography hides information within other data. So, the best fit for describing an authentication scheme that uses two or more factors is multifactor authentication.

Using multiple factors to authenticate strengthens verification by requiring independent credential types. Multifactor authentication covers any scenario with two or more factors, making it the general term for this approach. Two-factor authentication is a specific case of MFA where exactly two factors are used, but MFA remains the broader concept that can include more than two factors (for example, adding a biometric and a hardware token on top of a password). The other options don’t describe an authentication scheme: a password manager stores and autofills passwords, tokenization replaces data with tokens, and steganography hides information within other data. So, the best fit for describing an authentication scheme that uses two or more factors is multifactor authentication.