フリー問題

問題文

An image declares a port in its build file, but a client on the host still cannot reach the service. What does that declaration actually do, and what is missing?

選択肢

1. The declaration in the build file is only metadata for whoever reads the image and does not open any mapping on the host, so the operator must also map a host port to the container port when the container is stopped, which the engine records as a published identity of that container.
2. The declaration in the build file is only metadata for whoever reads the image and does not open any mapping on the host, so the operator must also map a host port to the container port when the container is created, which the engine records as a published binding of that container.
3. The declaration in the build file is only encryption for whoever reads the image and does not open any account on the host, so the operator must also map a host port to the container port when the container is created, which the engine records as a published binding of that container.
4. The declaration in the build file is only encryption for whoever reads the image and does not open any account on the host, so the operator must also map a host port to the container port when the container is stopped, which the engine records as a published identity of that container.