The EMP_DEPT block in your EMPLOYEE form is based on a view in an Oracle8 database. The items in this block have the Update Allowed property set to Yes. Which database feature makes it possible to permanently modify the underlying view?（）

• A、REF cursor. 
• B、Instead Of trigger. 
• C、Stored procedure that returns object values. 
• D、The underlying view cannot be modified because DML on a view is not supported.