Option A is the correct answer because the question describes a Linux executable that was running at the time of the attack and then deleted or erased from normal file-system visibility. In Linux forensics, if a process is still running, the executable image may still be accessible through the /proc/$PID/exe link for that process. Copying that path to another location is a recognized way to preserve the executable content for analysis before the process terminates.
This aligns with CHFI v11's coverage of Linux file system analysis tools , Linux memory forensics , tools to collect volatile and non-volatile information on Windows and Linux , and Windows and Linux forensics using Python , all of which reflect the importance of understanding live Linux evidence sources and recovery opportunities.
The other options are unrelated to Linux executable recovery. The RECYCLER path is Windows-specific, and $R < # > style entries are associated with Windows Recycle Bin artifacts, not Linux process recovery.
Therefore, for a deleted-but-still-running Linux executable, the correct CHFI-aligned recovery command is cp
/proc/$PID/exe /tmp/file .