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A.DoS
B.exploit
C.propagation
D.port scanning
E.reconnaissance

A.SCREEN options are deployed at the ingress and egress sides of a packet flow.
B.Although SCREEN options are very useful， their use can result in more session creation.
C.SCREEN options offer protection against various attacks at the ingress zone of a packet flow.
D.SCREEN options examine traffic prior to policy processing， thereby resulting in fewer resouces used formalicious packet processing.