フリー問題

問題文

Inside the treatment works, several controllers have to act on the same measurement within a window of a few hundred microseconds, and the works network also carries ordinary office traffic. The note has to name the mechanism that keeps the critical traffic inside its window and the item that all the controllers have to agree on first. Which pairing belongs in the note?

選択肢

1. The note sets the scheduling mechanism that this shared works network cannot manage without, and each controller settles the oscillator clock that the instrumentation names.
2. The note sets the flooding mechanism that this shared works network cannot manage without, and each controller settles the oscillator clock that the instrumentation names.
3. The note sets the scheduling mechanism that this shared works network cannot manage without, and each controller settles the reference clock that the instrumentation names.
4. The note sets the flooding mechanism that this shared works network cannot manage without, and each controller settles the reference clock that the instrumentation names.