搜题，就来89问答库（） is not a physical wall, but a lot of virtual data to protect the computer network.
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（） is not a physical wall, but a lot of virtual data to protect the computer network.
- A: Date wall
- B: Date channel
- C: Database
- D: Firewall
请帮忙给出正确答案和分析，谢谢！
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