Final answer:
A medium-secure password should be at least 15 characters long with a mix of character types; however, using common elements like specific words or sequences can weaken security. Option D is correct.
Step-by-step explanation:
The criteria for creating a medium-secure password stated in the question requires at least 15 characters. Adding to that main requirement, it specifies that the password must include one of the following: the word "Password," the sequence "123456," the combination "abc123," or a mix of uppercase, lowercase, numbers, and symbols.
However, including common words or sequences like "Password," "123456," or "abc123" in your password is not a secure practice. Instead, the recommended approach to creating a secure password is to use a random mix of uppercase and lowercase letters, numbers, and symbols, ensuring that the password is not easily guessable and does not include common words or number sequences. The length of the password combined with character variety is what contributes to its security.
A medium-secure password must have at least 15 characters and include a mix of uppercase letters, lowercase letters, numbers, and symbols. It should not contain common passwords like 'Password', '123456', or 'abc123'.