Which control requires multiple verification methods for access?

• A. Password-Based Access
• B. Single Sign-On
• C. Role-Based Access Control
• D. Multi-Factor Authentication

Answer: (D)

Requiring multiple verification methods for access is the hallmark of Multi-Factor Authentication. MFA strengthens security by combining different types of proof that you are who you claim to be, such as something you know (a password), something you have (a code from an authenticator app or a hardware token), and something you are (a biometric). With MFA, even if one factor is compromised, an attacker would still need additional factors to gain access.

Password-based access uses only one factor, typically something you know. Single Sign-On focuses on a seamless login experience across multiple services with one session, not on using multiple verification methods. Role-Based Access Control determines what resources a user can access after authentication, not how authentication is performed.