フリー問題

問題文

A remote pumping station relies on a link to the platform to receive its operating setpoints. The link is lost for several hours at a time. Which local behavior keeps the station useful during those periods?

選択肢

1. The station stays useful by retrying on repeated connection attempts during the outage.
2. The station stays useful by running on retained safe setpoints during the outage.
3. The station stays useful by stopping on missing platform instructions during the outage.
4. The station stays useful by reverting on fixed factory defaults during the outage.