Final answer:
A thread control block (TCB) contains information about a thread, including states like Ready, Running, Sleeping, and Completed. However, the state that is NOT a part of the TCB is Completed.
Step-by-step explanation:
A thread control block (TCB) is a data structure that contains information about a thread. Among the various states a thread can be in, the TCB includes states like Ready, Running, Sleeping, and Completed.
However, the state that is NOT a part of the thread control block is Completed. When a thread is completed, it is terminated and its TCB is no longer needed.