Step 1: Understanding the components of a strong password.
A strong password is typically one that is hard to guess. It should include a combination of letters (both uppercase and lowercase), numbers, and special characters. This mix increases the complexity of the password, making it harder to crack.
Step 2: Analyzing the options.
- (A) Only letters: Incorrect. Using only letters makes a password easier to guess and less secure.
- (B) Numbers and special characters: Incorrect. While this is a good start, using only numbers and special characters may still be vulnerable without letters.
- (C) Name of a person: Incorrect. Using the name of a person makes the password very easy to guess and is not recommended for security.
- (D) Letters, numbers and special characters: Correct. This is the best practice for creating a strong password, as it includes a diverse set of characters that increase password strength.
Step 3: Conclusion.
Therefore, the correct answer is (D) Letters, numbers and special characters, as it creates a strong, complex password.
Final Answer:} Letters, numbers and special characters.