单选

●The (75)is designed specific

●The (75)is designed specifically as a security system for preventing unauthorized communications between one computer network and another computer network. (75)A.firewall
B.protocol
C.hacker
D.virus

试题出自试卷《2012年上半年软考《程序员》上午试卷（参考答案＋解析版）》

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