フリー問題

問題文

Another service owner requires that the application be usable again within thirty minutes of a failure. The operator has to decide which part of the design carries that number. Which choice carries that requirement?

選択肢

1. The thirty minute requirement is carried by selected archive target, because how quickly the service becomes usable follows transfer cost and not the spacing between captures.
2. The thirty minute requirement is carried by chosen recovery method, because how quickly the service becomes usable follows restore mechanics and not the spacing between captures.
3. The thirty minute requirement is carried by chosen capture frequency, because how quickly the service becomes usable follows snapshot spacing and not the spacing between captures.
4. The thirty minute requirement is carried by selected retention length, because how quickly the service becomes usable follows stated timing and not the spacing between captures.