What is multifactor authentication (MFA)?

• A. A method requiring multiple passwords for access
• B. A security method requiring multiple forms of verification
• C. A technique for encrypting sensitive information
• D. A way to set up single sign-on for applications

Answer: (B)

Multifactor authentication (MFA) is a security method that significantly increases the protection of accounts and systems by requiring multiple forms of verification to grant access. This approach typically combines two or more different factors from the following categories: something you know (like a password), something you have (such as a smartphone or hardware token), and something you are (biometrics like fingerprints or facial recognition). The necessity for different types of verification makes it much harder for unauthorized individuals to gain access, as they would need to compromise multiple elements of the security process.

The other choices do not accurately represent MFA. For example, requiring multiple passwords for access refers to a single category of knowledge-based authentication, which does not enhance security through varied verification methods. The technique of encrypting sensitive information is unrelated to authentication methods but instead focuses on securing data during storage or transmission. Finally, setting up single sign-on for applications streamlines user access to multiple services with one set of credentials, but it does not involve multiple verification methods, which is the core principle of MFA. Thus, the correct choice effectively captures the essence of multifactor authentication.