Question 15
Domain 4 — Technology, Security, and Resilience ControlsWhat is multi-factor authentication (MFA)?
Correct answer: B
Explanation
Multi-factor authentication requires a user to prove identity with "two or more different factors," such as something they know, have, or are. Using multiple factors lowers the chance that a stolen password alone can grant access.
Why each option is right or wrong
A. Using multiple passwords
B. Verifying identity using two or more different factors
Under common authentication standards, MFA requires at least two distinct factor categories to establish identity, typically combining something the user knows, has, or is. A single password is only one factor, so the correct choice is the one describing verification by two or more different factors rather than one credential alone.
C. Logging in from multiple devices
D. Having multiple user accounts