Final answer:
The status of all MySQL server variables and their values can be checked using the 'SHOW VARIABLES' command. This is the most direct and comprehensive method for accessing server variable information in MySQL.
Step-by-step explanation:
To check the status of all MySQL server variables and their values, you would use the command: SHOW VARIABLES. This command provides a list of all server system variables for the current session. Each variable includes a name and a value. To execute this command, you can use the MySQL command-line tool, a database management tool with a graphical user interface, or embed the command in a script that interfaces with the MySQL server.
The other options provided do not serve the purpose for checking server variables specifically. Querying the 'mysql_status' table is not a standard method for checking MySQL variables, as this table does not exist by default. Checking the server's error logs provides details about server events and errors but not a full list of variable statuses. Lastly, the MySQL Control Panel may provide access to some settings, but not as comprehensively as the SHOW VARIABLES command does.