Which of the following best describes the purpose of using 'shall' versus 'may' in statutory drafting?
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A
'Shall' indicates a preference; 'may' indicates a prohibition.
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B
'Shall' imposes a mandatory obligation; 'may' confers a discretionary permission.
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C
'Shall' is used for past actions; 'may' is used for future actions.
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D
Both words are interchangeable in modern legal writing.