How can you better secure the Drupal admin user (user 1) from outside attacks?

How can you better secure the Drupal admin user (user 1) from outside attacks?
A . Do not give this user an obvious name like "admin" or "administrator" which are too easy to guess
B . Cancel the user account for user 1.
C . Remove the "Administrator" role from user 1, which makes them an anonymous user
D . Only allow members of the Drupal community in good standing to be user 1.

Answer: A