This was done with the root user who has all privileges, including the GRANT OPTION. Because this user has the GRANT OPTION, it can grant privileges to other users, and use the SHOW GRANTS command to display grants for other users.
|Title||:||MySQL Administrator's Bible|
|Author||:||Sheeri K. Cabral, Keith Murphy|
|Publisher||:||John Wiley & Sons - 2011-03-04|