A penetration tester conducts reconnaissance for a client's network and identifies the following system of...

A penetration tester conducts reconnaissance for a client's network and identifies the following system of interest:

$ nmap -A AppServer1.compita.org

Starting Nmap 7.80 (2023-01-14) on localhost (127.0.0.1) at 2023-08-04 15:32:27

Nmap scan report for AppServer1.compita.org (192.168.1.100)

Host is up (0.001s latency).

Not shown: 999 closed ports

Port State Service

21/tcp open ftp

22/tcp open ssh

23/tcp open telnet

80/tcp open http

135/tcp open msrpc

139/tcp open netbios-ssn

443/tcp open https

445/tcp open microsoft-ds

873/tcp open rsync

8080/tcp open http-proxy

8443/tcp open https-alt

9090/tcp open zeus-admin

10000/tcp open snet-sensor-mgmt

The tester notices numerous open ports on the system of interest. Which of the following best describes this system?