Exam PT0-002 topic 1 question 208 discussion

During the reconnaissance phase, a penetration tester obtains the following output:

Reply from 192.168.1.23: bytes=32 time<54ms TTL=128
Reply from 192.168.1.23: bytes=32 time<53ms TTL=128
Reply from 192.168.1.23: bytes=32 time<60ms TTL=128
Reply from 192.168.1.23: bytes=32 time<51ms TTL=128

Which of the following operating systems is MOST likely installed on the host?