フリー問題

問題文

A customer asks who decides which side keeps serving when the link between two synchronously replicated arrays breaks, and what deciding it in advance buys them. Which pair states those two points?

選択肢

1. The decision can be prepared before the break, so the moment of the break still needs the mediator and the prepared decision shortens the whole downtime in that specification.
2. The decision can be prepared before the break, so the moment of the break still needs the downstream and the prepared decision shortens the whole downtime in that specification.
3. The decision can be prepared before the break, so the moment of the break still needs the mediator and the prepared decision shortens the whole cancellation in that specification.
4. The decision can be prepared before the break, so the moment of the break still needs the downstream and the prepared decision shortens the whole cancellation in that specification.