Which of These Is Not a Basis for Authenticating a Person

Multiple Choice

Which of these is not a basis for authenticating a person and validating his or her identity?

A) Something they have (such as a key)
B) Something they know (such as a password)
C) Something they are (such a fingerprint)
D) Something they can do (such as a walking gait)
E) all of these are methods for authenticating users