フリー問題

問題文

A cold chain project has 900 trailers that publish temperature readings and three separate applications that each need the same readings for different purposes. The team wants to add a fourth application later without touching the trailers. Which messaging arrangement supports that?

選択肢

1. The team should route readings through a broker topic so a fourth consumer needs no change on the trailers.
2. The team should route readings through a direct link so a fourth consumer needs no change on the trailers.
3. The team should route readings through a file store so a fourth consumer needs no change on the trailers.
4. The team should route readings through a polling request so a fourth consumer needs no change on the trailers.