An employee is currently logged into the corporate web server, without permission. You log into the web server as 'admin" and look for the employee's username: "dmaul" using the "who" command. This…

The /var/log/messages file records general system and kernel messages and would not directly reflect or hide an active user session found via the 'who' command.

The bash history file (~/.bash_history) records commands executed by a user in the shell, and an attacker or unauthorized user may alter or clear it to remove evidence of their actions on the system. If the admin observes evidence of a session but finds the bash history empty or missing entries, it indicates the contents were deliberately altered. This is a common anti-forensic technique used to hide unauthorized access and command execution.

The utmp file is what the 'who' command reads to display currently logged-in users; if utmp were altered, the user would not appear in 'who' output at all, which contradicts the scenario.

HTTP access logs record web requests to the server and are unrelated to recording or concealing an interactive shell session by a logged-in user.