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The process state that indicates a process has stopped is represented by the letter "T". In Linux, when a process is in the "T" state, it signifies that the process has been stopped, usually due to receiving a signal like SIGSTOP or because it has been suspended by the user (for instance, via a job control command in a terminal).

When a process is stopped, it is not using any CPU time, and its resources are preserved in memory, allowing it to be resumed later. This is important for job control that allows users to manage multiple processes in a shell environment efficiently.

Understanding the other process states helps to clarify why "T" is the correct answer. The "S" state indicates a process that is sleeping, waiting for something to happen (like I/O), and is still active in terms of the CPU. The "Z" state refers to a zombie process, which has completed execution but still has an entry in the process table because its parent process hasn't collected its exit status. The "X" state is not a commonly recognized state in standard Linux process management.

In terms of process management, knowing these states is essential for system administration and troubleshooting, making it easier to handle processes effectively within a Linux environment.