Your question is Watchdog Timer Fundamentals. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
Explain what a watchdog timer is and how it works in embedded systems.
Cover the timer's purpose, timeout and reset behavior, heartbeat or servicing mechanism, and how it detects software that is hung or executing incorrectly. Explain key configuration and failure-mode considerations, including startup, debugging, and avoiding blind periodic servicing.