A password represents:
A.
Something you have.
B.
Something you know.
C.
All of the choices.
D.
Something you are.
Explanation:
The canonical example of something you know is a password or pass phrase. You might type or
speak the value. A number of schemes are possible for obtaining what you know.
It might be assigned to you, or you may have picked the value yourself. Constraints may exist
regarding the form the value can take, or the alphabet from which you are allowed to construct the
value might be limited to letters only. If you forget the value, you may not be able to authenticate
yourself to the system.