フリー問題

問題文

A sensor node transmits for 40 milliseconds each time it reports and sleeps in between. The team wants to double the battery life without changing the hardware. Which change is most likely to achieve that?

選択肢

1. Battery life doubles most likely by reporting less often across the day.
2. Battery life doubles most likely by shortening every payload across the day.
3. Battery life doubles most likely by raising transmit power across the day.
4. Battery life doubles most likely by batching every sample across the day.