A security engineer identified a new server on the network and wants to scan the host to determine if it is running an approved version of Linux and a patched version of Apache. Which of the following commands will accomplish this task?
A. nmap -f -sV -p80 192.168.1.20
B. nmap -sS -sL -p80 192.168.1.20
C. nmap -A -T4 -p80 192.168.1.20
D. nmap -O -v -p80 192.168.1.20
