You want to change the file that contains the message which is used at the login prompt when users log in locally.
(Please enter the file including the path)
Answer: /etc/issue
Explanation/Reference:
From the man pages:
The file /etc/issue is a text file which contains a message or system identification to be printed before the login prompt.
i think the correct answer is /etc/issue.net because Q. said “at the log in prompt” NOT “before user login”