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Firewalk has just completed the second phase (the scanning phase), and a technician receives the...

Firewalk has just completed the second phase (the scanning phase), and a technician receives the output shown below. What conclusions can be drawn based on these scan results?

TCP port 21 no response

TCP port 22 no response

TCP port 23 Time-to-live exceeded

A.

The lack of response from ports 21 and 22 indicate that those services are not running on the destination server

B.

The scan on port 23 was able to make a connection to the destination host prompting the firewall to respond with a TTL error

C.

The scan on port 23 passed through the filtering device. This indicates that port 23 was not blocked at the firewall

D.

The firewall itself is blocking ports 21 through 23 and a service is listening on port 23 of the target host

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