Which two statements are true about using the OR REPLACE clause when creating named subprograms? (Choose two.)

A: Function based indexes remain usable when replacing the function on which the index depends. B: Object privileges to execute a replaced function must be regranted to those users who had the privilege. C: This clause can be used only for procedures and functions. D: A function definition can be modified without dropping and re-creating it. E: Object privileges to execute a replaced function are retained by those users who had the privileges.