Which of the following is the WEAKEST authentication mechanism?

Which of the following is the WEAKEST authentication mechanism?
A .  Passphrases
B .  Passwords
C .  One-time passwords
D .  Token devices

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Answer: B

Explanation: Most of the time users usually choose passwords which can be guessed , hence passwords is the BEST answer out of the choices listed above.

The following answers are incorrect because :

Passphrases is incorrect as it is more secure than a password because it is longer.

One-time passwords is incorrect as the name states , it is good for only once and cannot be reused. Token devices is incorrect as this is also a password generator and is an one time password mechanism.

Reference : Shon Harris AIO v3 , Chapter-4 : Access Control , Page : 139 , 142.