Which of the following is a best practice for creating strong passwords?

• A. Reuse the same password on multiple sites.
• B. Use common words for memorability.
• C. Use a long mix of upper/lowercase letters, numbers, and symbols.
• D. Use shorter passwords for convenience.

Answer: (C)

The main idea is password entropy: the longer and more diverse your password, the harder it is to guess. When you use a long sequence that includes uppercase and lowercase letters, numbers, and symbols, the number of possible combinations grows dramatically. That means brute-force attempts or guessing attacks take much longer, making the password far stronger. This is why a long, complex password is the best practice.

Keep in mind that reusing the same password on multiple sites is risky—if one site is breached, all accounts using that password can be exposed. Using common words makes your password easy to crack with dictionary attacks. And shorter passwords are simply easier to defeat.