フリー問題

問題文

Two engineers apply the same infrastructure definition at the same time and the recorded state ends up inconsistent. Which arrangement prevents that?

選択肢

1. Keep the state in a developer local directory that grants one exclusive write lock for the duration of each apply.
2. Keep the state in a developer local directory that grants one common read handle for the duration of each apply.
3. Keep the state in a shared remote backend that grants one common read handle for the duration of each apply.
4. Keep the state in a shared remote backend that grants one exclusive write lock for the duration of each apply.