Final answer:
Possession is a credential category used in multifactor authentication. It involves something physical that the user possesses, such as a key card or token. This ensures added security.
Step-by-step explanation:
The credential category used in multifactor authentication is Possession. Multifactor authentication is a security measure that requires multiple forms of identification to grant access to a system or application. One of the categories of credentials used in this process is possession, which typically involves something physical that the user possesses, such as a key card, token, or mobile device. This ensures that even if someone gains access to the user's password or knowledge-based information, they still cannot authenticate without the possession factor.