フリー問題

問題文

Which option correctly names the three message patterns the core protocol defines?

選択肢

1. Request and response, publish and subscribe over a dedicated broker channel, and remote procedure streaming, in which the server holds a persistent channel open and pushes both requests and responses over it for the lifetime of the connection.
2. Request and response, multi round-trip requests, and subscribe and notify.
3. Initialize, operate, and shut down, which is also the order in which the lifecycle section lists them.
4. Synchronous calls and asynchronous calls, with a separate pattern defined for each of the transports.