Which two statements are true about the mysql_upgrade command? 

A the mysql_upgrade command executes on a stopped MYSQL server data directory to ensure that it is prepare for upgrade. 

B the mysql_upgrade command is a utility that patches mysqld binary from its base version to a new version 

C the mysql_upgrade command also execute the mysqlcheck command in order to provide all of its functionality.

 D the sql_upgrade command is run to check and attempt to fix tables for certain incompatibilities with the current version of MYSQL