Which of the following techniques ensures that a value submitted in a form can only be yes or no?

Which of the following techniques ensures that a value submitted in a form can only be yes or no?
A . Use a select list that only lets the user choose between yes and no.
B . Use a hidden input field that has a value of yes or no.
C . Enable the safe_mode configuration directive.
D . None of the above.

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Answer: D