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.