フリー問題

問題文

A team runs two identical production setups and wants to release with as little downtime as possible. How does the blue-green strategy behave?

選択肢

1. Only one of those environments carries split traffic at each moment, and the previous version returns once the routing is shifted back to it.
2. Only one of those environments carries split traffic at each moment, and the previous version returns once the routing is rewritten back to it.
3. Only one of those environments carries exclusive traffic at each moment, and the previous version returns once the routing is rewritten back to it.
4. Only one of those environments carries exclusive traffic at each moment, and the previous version returns once the routing is shifted back to it.