What method of access control requires multiple forms of authentication?

Multifactor Authentication (MFA) is the correct answer because it specifically involves the use of two or more different factors to verify a user's identity before granting access to a system or data. These factors typically fall into three categories: something you know (like a password), something you have (like a security token or smart card), and something you are (biometric data such as fingerprints or facial recognition).

Utilizing multiple forms of authentication significantly enhances security by making it more difficult for unauthorized individuals to gain access. Even if one factor is compromised, additional factors are still required to complete the authentication process.

In contrast, other options do not relate to the requirement of multiple forms of authentication. Masking pertains to concealing data to protect sensitive information rather than verifying access. Mean time to repair refers to the average time taken to fix a fault or issue with a system, which does not involve authentication. The management plane is concerned with administrative functions and controls for managing system operations, not specifically access control methods.