You want a record of all queries that are not using indexes. How would you achieve this?（）

• A、By enabling the Slow Query Log because all queries that are not using indexes will be logged automatically
• B、By enabling the Error Log because not using indexes is an error
• C、By enabling the Slow Query Log and using the – log-queries-not-using-indexes option
• D、By enabling the Error Log and using the – log-queries-not-using-indexes option