Final answer:
The incorrect STAT column value for the ps command is 'Status E means exited'. Processes that have exited do not usually appear in the ps command's output. Instead, 'R' stands for running, 'S' for sleeping, with other codes like 'Z' for zombie processes.
Step-by-step explanation:
The value for the STAT column of the ps command which is not true is: 3) Status E means exited. In the context of Unix and Linux operating systems, the ps command (process status) displays information about active processes. Status R indeed means that a process is running or ready to run. Status S is for processes that are in an interruptible sleep, waiting for an event to complete. However, exited processes typically do not have a status code within the ps command output since they are no longer active. Instead, the status codes one might see are Z for zombie processes (those that have completed execution but still have an entry in the process table) or T for stopped (traced) processes. Therefore, Status E as exited is incorrect and not a standard status indicator used by the ps command for active processes.