Final answer:
Option D) choosing a common name that is easy to remember, is not a key to keeping strong passwords as it compromises security by making it easier to guess or crack the password.
Step-by-step explanation:
The answer to which of the following is not a key to keeping strong passwords is D) choose a common name that is easy to remember.
Strong passwords are essential for protecting your accounts and personal information. It's important to use a mixture of upper- and lowercase characters, change your password regularly, and ensure that your passwords are at least eight characters long.
However, selecting a common name that is easy to remember does the opposite of strengthening a password. It makes it easier for someone to guess or crack your password, leading to potential security breaches.