Answer :
When running nmap, the option that should be used to probe open ports to determine service/version information is called; allports command-line option
What is Nmap?
Nmap is simply a network scanner created by Gordon Lyon to discover hosts and services on a computer network through the process of sending packets and analyzing the responses.
Now, Nmap cannot determine whether the port is open because packet filtering prevents its probes from reaching the port. However, to probe open ports to determine service/version information, we will use the allports command-line option.
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