A penetration tester is conducting a port scan on a specific host. The tester found several ports opened that
were confusing in concluding the Operating System (OS) version installed. Considering the NMAP result below,
which of the following is likely to be installed on the target machine by the OS?
Starting NMAP 5.21 at 2011-03-15 11:06 NMAP scan report for 172.16.40.65 Host is up (1.00s latency). Not
shown: 993 closed ports PORT STATE SERVICE 21/tcp open ftp 23/tcp open telnet 80/tcp open http 139/tcp
open netbios-ssn 515/tcp open 631/tcp open ipp 9100/tcp open MAC Address: 00:00:48:0D:EE:8

A.
The host is likely a printer.

B.
The host is likely a Windows machine.

C.
The host is likely a Linux machine.

D.
The host is likely a router.

Explanation:
The Internet Printing Protocol (IPP) uses port 631.
https://en.wikipedia.org/wiki/List_of_TCP_and_UDP_port_numbers