Multifactor authentication requires two of the following except:

Multifactor authentication (MFA) enhances security by requiring users to provide two or more different types of authentication factors to verify their identity. The primary categories of these factors include:

• Something you know: This involves knowledge-based authentication, such as a password or a PIN that the user remembers.
• Something you have: This factor refers to a physical device that the user possesses, such as a smartphone, security token, or key fob that can generate a one-time passcode.
• Something you are: This category involves biometric authentication, which relies on unique physical characteristics of the user, such as fingerprints, facial recognition, or iris scans.

The option regarding "something you do" is not traditionally included in the standard classifications of authentication factors required for MFA. While certain systems may assess behavioral biometric factors, such as the way a user types or interacts with a device, this is not a core aspect of multifactor authentication as defined by the recognized standards. Thus, "something you do" does not fit within the established framework for MFA, making it the exception in this context.