According to the scenario, John will use "nmap -v -O 208.100.2.25" to detect the operating system of the we-are-secure server. Here, -v is used for verbose and -O is used for TCP/IP fingerprinting to guess the remote operating system. John may also use the DNS name of we-are-secure instead of using the IP address of the we-are-secure server. So, he can also use the nmap command "nmap -v -O www.we-are-secure.com ". Answer: C is incorrect. "nc -v -n 208.100.2.25 80" is a Netcat command, which is used to banner grab for getting information about the