A cybersecurity analyst is conducting a port eccouncil video

Full Certification Question

A cybersecurity analyst is conducting a port scan of 192.168.1.45 using nmap. During the scan, the analyst found numerous ports open, and nmap could not determine the Operating System version of the system installed at 192.168.1.45. The analyst asks you to look over the results of their nmap scan results: -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- Starting NMAP 7.60 at 2020-06-12 21:23:15 NMAP scan report for 192.168.1.45 Host is up (0.78s latency). Not shown: 992 closed ports PORT STATE SERVICE 21/tcp open ftp 23/tcp open telnet 25/tcp open smtp 80/tcp open http 139/tcp open netbios-ssn 515/tcp open 631/tcp open ipp 9100/tcp open MAC Address: 00:0C:29:18:6B:DB -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- Which of the following operating systems is most likely used by the host?