（单选题）
The users request that [F2], [F3], and [F4] be used to commit, rollback, and exit,respectively. How do you accomplish this?（）
AAdd the appropriate PL/SQL code for each key.
BMap the logical keys to the physical keys, then add the appropriate PL/SQL code for each key.
CCreate an object library to define the key triggers, then reference the object library in the form.
DThis cannot be accomplished because other function keys provide this functionality by default.
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