'Something You Have': Multifactor Authentication

D.

When using multifactor authentication, the different factors that can be used are:

1. Something you know: Such as a password or a PIN.
2. Something you have: Such as an ID card, a security token or a smartphone.
3. Something you are: Such as a fingerprint or a facial recognition.

Out of the given options, only the option D, an ID card, represents "something you have".

An ID card is a physical object that can be carried and presented as evidence of identity. In the case of multifactor authentication, the ID card serves as the second factor to confirm the identity of the user, in addition to the password or PIN. The ID card may contain a magnetic strip, a barcode, or an embedded chip that can be read by a card reader to verify the identity of the user.

It's important to note that a password or PIN are considered "something you know", whereas a fingerprint or facial recognition are "something you are". These factors rely on biometric data to authenticate the user.

Multifactor authentication is a security measure that combines two or more of these factors to provide an added layer of security and reduce the risk of unauthorized access. By requiring a combination of different factors, multifactor authentication can make it more difficult for attackers to gain access to sensitive data or systems.