Which of the following is an effective measure against a certain type of brute force password attack?

Which of the following is an effective measure against a certain type of brute force password
attack?

A.
Password used must not be a word found in a dictionary.

B.
Password history is used.

C.
Password reuse is not allowed.

D.
None of the choices.

Explanation:
Password reuse is not allowed (rotating passwords). Password history must be used to
prevent users from reusing passwords. On all systems with such a facility the last 12
passwords used will be kept in the history. All computer system users must choose
passwords that cannot be easily guessed. Passwords used must not be a word found in a
dictionary.