問題文
A site wants protection against a mistaken update while keeping the standby ready to open within a minute. Two designs are compared. Which one satisfies both goals?
選択肢
- Apply runs continuously and a nightly backup marks the moment before the risky work so the copy stays current and the operator can step back
- Apply is stopped by the operator and a restore point marks the moment before the risky work so the copy stays current and the operator can step back
- Apply runs continuously and a restore point marks the moment before the risky work so the copy stays current and the operator can still step back
- Apply is held back by a fixed delay and a restore point marks the moment before the risky work so the copy stays current and the operator can step back