A penetration tester has successfully exploited an application vulnerability and wants to remove the command history from the Linux session. Which of the following will accomplish this successfully?

'history --remove' is not a valid flag for the bash history built-in; no such option exists in the bash manual.

'cat history | clear' is a nonsensical command - 'clear' redraws the terminal screen and does not accept piped input or interact with shell history in any way.

'rm -f ./history' attempts to delete a file named 'history' in the current working directory, which is not the bash history file; the actual history file is located at ~/.bash_history.

The '-c' flag for the bash 'history' built-in clears all entries from the current session's in-memory history list. Because bash writes history to ~/.bash_history only when the session exits, clearing it in-memory with 'history -c' ensures no commands from the session are saved, effectively covering the attacker's tracks for that session.