Which of the following tools can you use to accomplish the task?

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John works as a professional Ethical Hacker. He is assigned a project to test the security of www.abc.com. You have searched all open ports of the ABC server. Now, you want to perform the next information-gathering step, i.e., passive OS fingerprinting.

Which of the following tools can you use to accomplish the task?
A . P0f
B . Superscan
C . Nmap
D . NBTscan

Answer: A