Destination unreachable administratively prohibited messages can inform the hacker to what?

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D. That a router or other packet-filtering device is blocking traffic ICMP Destination Unreachable code 13 (administratively prohibited) is generated specifically by routers, firewalls, or ACL-enforcing devices when a packet is blocked by a configured policy rule. This tells a hacker or scanner that a filtering device exists in the path and is dropping traffic based on administrative access control configuration.

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A. That a circuit level proxy has been installed and is filtering traffic Circuit-level proxies operate at the session layer and silently drop or reset connections rather than generating ICMP administratively prohibited messages.

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B. That his/her scans are being blocked by a honeypot or jail Honeypots are designed to attract and mimic services for attackers and do not typically respond with ICMP administratively prohibited messages.

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C. That the packets are being malformed by the scanning software Malformed packets would trigger ICMP Parameter Problem messages, not administratively prohibited messages.

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E. That the network is functioning normally An administratively prohibited message explicitly signals that traffic is being blocked, which is the opposite of normal network operation.

Destination unreachable administratively prohibited messages can inform the hacker to what?

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