Which of the following is a correct example to remove an index from a table?

		DELETE INDEX Index_Name ON Table_Name;
		DROP INDEX ON Table_Name;
		DROP INDEX Index_Name ON Table_Name;
		DROP INDEX Index_Name ON Column_Name;

Match each activity/process/task used to implement the computerised counter measures to protect database security with the corresponding description. For example Journaling: process of keeping and maintaining a log file (or journal) of all changes made to database to enable effective recovery in event of failure Recovery: process adopted in the event of database failure to restore the database to the latest consistent state using backup and journaling A. Profile B. Auditing C. View D. Backup E. Authorisation F. Encryption G. Integrity , Collection of settings that limits the use of system resources and the database ., Process of periodically taking a copy of the database and log file (and possibly programs) to offline storage media. The encoding of the data by a special algorithm that renders the data , The granting of a right or privilege, which enables a subject to , Prevents data from becoming invalid, and hence giving misleading or unreadable by any program without the decryption key. legitimately have access to a system or a system's object. incorrect results. , Monitoring and recording of selected users' suspected database actions. Powerful, flexible and simple mechanism by hiding certain important attributes or rows from certain users