● （73） is the first line of protect between your computer and the public Internet. （73）A.

● （73） is the first line of protect between your computer and the public Internet.

（73）

A. The Internet protocol

B. The firewall

C. The anti-virus software

D. The intrusion-detection systems

请帮忙给出正确答案和分析，谢谢！

参考答案

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