フリー問題

問題文

A service must switch to a new version with no request served by a half-updated fleet, and the old fleet must stay ready for an instant return. Which strategy fits?

選択肢

1. Bring up a partial node subset and move the global database to it once the checks pass.
2. Bring up a complete parallel environment and move the live traffic to it once the checks pass.
3. Bring up a complete parallel environment and move the global database to it once the checks pass.
4. Bring up a partial node subset and move the live traffic to it once the checks pass.