Explanation: Answer options C, B, and A are correct.
The open_basedir is used to limit the files that PHP can open to a specified directory tree. If the file/directory exists within the directory tree speci?ed by the open_basedir, it is successfully succeeded; otherwise, it fails to open the file. The disable_functions and disable_classes functions allow you to disable certain native PHP functions and classes for security reasons. safe_mode resolves the security related issues during shared hosting; however, it does not resolve all issues so it is highly depreciated in PHP5.
Answer option D is incorrect. It is not the correct directive name.