フリー問題

問題文

As an event flows through a Mule application, which description of how its parts are used across the flow is correct?

選択肢

1. The payload carries the data being processed and can be transformed, the attributes carry metadata from the source, and variables hold values the flow sets for later steps.
2. A Mule event has no distinct parts that are used differently across a flow, so the whole of it is one single blob.
3. The payload holds only the flow's name, the attributes store the entire application's source code, and variables are the physical servers it runs on.
4. All three parts are identical copies of the same value, so changing the payload also rewrites the attributes automatically.