Assume that you want to know which Mysql Server options were set to custom values. Which two methods would you use to find out? A. Check the configuration files in the order in which they are read by the Mysql Server and compare them with default values. B. Check the command-line options provided for the Mysql Server and compare them with default values. C. Check the output of SHOW GLOBAL VARIABLES and compare it with default values. D. Query the INFORMATION_SCHEMA.GLOBAL_VARIABLES table and compare the result with default values. 答案:CD