フリー問題

問題文

Two services must keep working when the other is unavailable, and a request that cannot be handled now must be processed later without being lost. The architect must choose the interaction form that gives that property. Which form is it?

選択肢

1. The interaction form to pick is session state externalization for this pair.
2. The interaction form to pick is container image isolation for this pair.
3. The interaction form to pick is message queue decoupling for this pair.
4. The interaction form to pick is client server partitioning for this pair.