The users request that [F2], [F3], and [F4] be used to commit, rollback, and exit,respectively. How do you accomplish this?（）

• A、Add the appropriate PL/SQL code for each key. 
• B、Map the logical keys to the physical keys, then add the appropriate PL/SQL code for each key.
• C、Create an object library to define the key triggers, then reference the object library in the form. 
• D、This cannot be accomplished because other function keys provide this functionality by default.