Which one of the following methods requires saving the value of the CPU registers from the thread being switched out and restoring the new thread being scheduled?

• Context switching between kernel-level threads involves saving the state of the CPU registers (like program counter, stack pointer, etc.) from the currently running thread before switching to another thread.
• This process ensures that when the original thread is scheduled back, its previous state can be stored, allowing it to continue execution from where it was interrupted.
• This context-switching mechanism enables the operating system to efficiently manage multiple threads, allowing them to share the CPU and execute concurrently.

Here, option 1 is correct.