Question

strong passwords should use at least one number and one
○ a. special character
○ b. symbol
○ c. punctuation mark
○ d. letter

Explanation:

Strong passwords typically require a combination of different character types for security. A strong password should use at least one number and one letter (along with other types like special characters in some cases, but the key here is that among the options, a letter is a fundamental component. Special characters, symbols, and punctuation marks are more specific subsets, but the basic requirement often includes a letter (and a number). So the correct option is d as a strong password needs at least one number and one letter (along with potentially other character types).

Answer:

d. letter