Your question is Polling vs Interrupt-Driven I/O. 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 the difference between polling and interrupt-driven I/O. When would you choose one over the other in an embedded system, and what trade-offs would you consider around CPU usage, latency, and implementation complexity?