Which of the following can be used to protect your system against brute force password attack?

A.
Decrease the value of password history.

B.
Employees must send in a signed email before obtaining a password.

C.
After three unsuccessful attempts to enter a password, the account will be locked.

D.
Increase the value of password age.

Explanation:
Employees must show up in person and present proper identification before obtaining a
new or changed password (depending on your policy). After three unsuccessful attempts
to enter a password, the account will be locked and only an administrator or the help
desk can reactivate the involved user ID.