Which of the following is NOT a credential of two-factor authentication?

Two-factor authentication (2FA) is a security mechanism that requires two different forms of identification from users to verify their identity. The credentials used for 2FA typically fall into three categories: something you know (like a password or PIN), something you have (like a security token or card), and something you are (such as biometric data).

Date of birth is generally considered a piece of personal information rather than a credential for authentication. While it may be used as a security question in some contexts, it does not fit the 2FA model because it is not a unique or secure form of verification.

On the other hand, a fingerprint is a biometric identifier that falls into the "something you are" category. A personal identification number (PIN) is a "something you know" credential. A contactless card device can be categorized as "something you have," as it is a physical token used to gain access or complete transactions. Thus, these options are all valid credentials for two-factor authentication, while date of birth does not meet the criteria.