Microsoft Azure Fundamentals AZ-900 Practice Question

The correct answer is Multi-factor authentication (MFA), which requires users to provide two or more verification factors-something they know (like a password), something they have (such as a phone or hardware token), or something they are (biometrics). MFA adds a critical second layer of security to sign-ins and transactions. Single sign-on (SSO) improves the user experience by letting users access multiple applications with one set of credentials, but it does not by itself enforce multiple factors. Passwordless authentication removes the password and relies on a single strong credential like a biometric or FIDO2 key; unless MFA is also required, it remains one factor. Business-to-business (B2B) collaboration is designed for granting external partners guest access and does not specifically enforce multiple verification methods.