フリー問題

問題文

A water utility measures pressure at 400 valve stations and forwards each reading to a central platform. When a reading exceeds a configured limit the platform issues a command that opens a relief valve. In the Networks of Things model published by NIST, which element does that command represent?

選択肢

1. In that model the command represents the pressure sensor.
2. In that model the command represents the communication channel.
3. In that model the command represents the decision trigger.
4. In that model the command represents the reading aggregator.