A thread is usually defined as a ‘light weight process’ because an operating system (OS) maintains smaller datastructures for a thread than for a process. In relation to this, which of the followings is TRUE?

• A. On per-thread basis, the OS maintains only CPU register state
• B. The OS does not maintain a separate stack for each thread
• C. On per-thread basis, the OS does not maintain virtual memory state
• D. On per thread basis, the OS maintains only scheduling and accounting information.