A thread is usually defined as a light weight process because an Operating System (OS) maintains smaller data structure for a thread than for a process. In relation to this, which of the following statement is correct?

• A. OS maintains only scheduling and accounting information for each thread.
• B. OS maintains only CPU registers for each thread.
• C. OS does not maintain a separate stack for each thread.
• D. OS does not maintain virtual memory state for each thread.