QUESTION 1 What is the purpose of the ROLLBACK command? O none of these answers O The ROLLBACK command rolls back all the updates since the last COMMIT. O The ROLLBACK command rolls back all the updates since the last ROLLBACK. O The ROLLBACK command advances all the updates since the last COMMIT QUESTION 2 The DCL commands are used by the business end users of a database system. True False QUESTION 3 The data manipulation DBMS component is used: By no end users By end users, via front-end applications only By end users, either directy or via front-end applications end use rectly on