Final Answer:
Azure Multi-Factor Authentication requires two or more elements to confirm identities. Three such elements are: 1) Username and password, 2) Security questions, and 3) Biometric data (Options A, B, and C).
Step-by-step explanation:
Username and Password (Option 1): The traditional combination of a username and password is one factor used in multi-factor authentication.
Security Questions (Option 2): Asking security questions that only the legitimate user would know is another factor to enhance authentication.
Biometric Data (Option 3): Biometric authentication involves unique physical or behavioral traits such as fingerprints, facial recognition, or iris scans.
One-Time Password (Option 4): While not listed in the question, a one-time password generated through a mobile app or hardware token is another common factor.
Options A, B, and C are the answer.