John works as a contract Ethical Hacker. He has recently got a project to do security checking for www.we-are-secure.com. He wants to find out the operating system of the we-are-secure server in the information gathering step. Which of the following commands will he use to accomplish the task?
Each correct answer represents a complete solution. Choose two.
A . nc 208.100.2.25 23
B . nc -v -n 208.100.2.25 80
C . nmap -v -O 208.100.2.25
D . nmap -v -O www.we-are-secure.com
Answer: C,D