Nmap OS Detection

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Q: As a contracted Ethical Hacker, Al has recently contracted to complete a project to do security checking on a website. He wants to find out which operating system is used by the web server. Which of the below commands can he use to complete this task?

Each correct answer represents a complete solution. Choose two.

a. nmap -v -O 208. 100. 2. 25

b. nc -v -n 208. 100. 2. 25 80

c. nc 208. 100. 2. 25 23

d. nmap -v -O [www.website.com]

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