What Is Multifactor Authentication

What is multifactor authentication?

A) The traditional security process, which requires a username and password.
B) Requires the user to provide two means of authentication, what the user knows (password) and what the user has (security token) .
C) Requires more than two means of authentication such as what the user knows (password) , what the user has (security token) , and what the user is (biometric verification) .
D) The identification of a user based on physical characteristic such as a fingerprint, iris, face, voice or handwriting.