フリー問題

問題文

Adding a rack to a running blueprint fails with a message saying that a value is already in use. Which cause explains that?

選択肢

1. The reason proves to be reassigned resource value inside that observed blueprint implementation.
2. The reason proves to be nondefault routing membership inside that observed blueprint implementation.
3. The reason proves to be blueprint locking duty inside that observed blueprint implementation.
4. The reason proves to be panel layout definition inside that observed blueprint implementation.