Which of the following is the single best rule to enforce when designing complex passwords?
a. maximum password age
b. longer passwords
c. force use of all four types of characters (uppercase, lowercase, numbers, symbols)
d. computer generated passwords

B. Longer passwords

Explanation:

If the password is longer, it requires more incorrect attempts to find it, so the system could identify a potential hacker attempt. Smaller but more complex passwords could be identified by mistype or forgotten passwords.

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