【单选题】
A <{p}>Deny application facebook-chat before allowing application facebook<{br/}><{/p}>
B <{p}>Deny application facebook on top<{br/}><{/p}>
C <{p}>Allow application facebook on top<{br/}><{/p}>
D <{p}>Allow application facebook before denying application facebook-chat<{br/}><{/p}>
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