What is a type of multifactor authentication (MFA)?

A one-time password (OTP) is indeed a type of multifactor authentication (MFA). MFA enhances security by requiring users to provide two or more verification factors to gain access to a resource, such as an application or online account. One-time passwords are typically generated for a single login session or transaction and provide an additional level of security beyond the traditional username and password.

Using an OTP, which is usually sent via SMS or generated through an authentication app, requires something the user knows (their password) and something the user has (the OTP), thus fulfilling the core requirement of multifactor authentication. This layered approach makes it significantly harder for unauthorized users to gain access, as they would need both the password and the OTP.

The other options provided do not fully represent the multifactor authentication paradigm. Fingerprints and ID cards are examples of biometric or physical authentication factors but do not encompass the broader definition of MFA as they can be independent authentication methods not necessarily paired with another factor. A password alone does not constitute MFA since it relies solely on one factor, making it less secure compared to a system that employs multiple different factors for authentication purposes.