Which of the following is NOT a valid description of the public role?

191.

Captures all default permissions for users in a database.

The public role can be dropped.

Is contained in every database, including master, msdb, tempdb, model, and all user databases.

Cannot have users, groups, or roles assigned to it because they belong to the role by default

The Public role is the equivalent of the NT Everyone or Authenticated Users group. Any user added to the database is automatically added to that role - including the guest login if you choose to allow it. This means that any permissions you grant to Public automatically extend to all users. Plus, you cannot drop the Public role.