Answer:
Option C is the correct answer for the above question
Explanation:
NMAP stands Network mapper, which is used to discover the host and detect the service. It is also used to detect the Operating system. It is used to track the host and devices used on the internet to send the packets which are demanding from the host.
The question also asked about the tool which is used to keep the track of new devices. The Nmap will be the answer because it used to keep track of the devices which are participating on the internet. Hence the C option is correct while the other is not because--