An organization is concerned that its hosted web servers are not running the most updated version of the
software. Which of the following would work BEST to help identify potential vulnerabilities?


A. hping3 -S comptia.org -p 80
B. nc -l -v comptia.org -p 80
C. nmap comptia.org -p 80 -sV
D. nslookup port=80 comptia.org