A smart card represents:
A.
Something you are.
B.
Something you know.
C.
Something you have.
D.
All of the choices.
Explanation:
Another form of authentication requires possession of something such as a key, a smart
card, a disk, or some other device. Whatever form it takes, the authenticating item
should be difficult to duplicate and may require synchronization with systems other
than the one to which you are requesting access. Highly secure environments may require
you to possess multiple things to guarantee authenticity.