单项选择题

WhatistrueaboutaPre－BlockACLconfiguredwhensettingupyoursensortoperformIPBlocking？（）

A.ThePre-BlockACLisoverwrittenwhenablockingactionisinitiatiedbythesensor
B.TheblockingACLentriesgeneratedbythesensoroverridethePre-BlockACLentries
C.ThePre-BlockACLentriesoverridetheblockingACLentriesgeneratedbythesensor
D.ThePre-BlockACLisreplacedbythePost-BlockACLwhenablockingactionisinitiatedbythesensor
E.YoucannotconfigureaPre-BlockACLwhenconfiguringIPBlockingonyoursensor

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