問題文
A billing application must receive every meter reading exactly once, and the meters use a link that occasionally drops a message. A separate dashboard shows the same readings and can tolerate gaps. Which use of MQTT delivery levels fits both needs at the lowest cost?
選択肢
- The lowest cost fit is unconfirmed delivery levels across the two paths.
- The lowest cost fit is mixed delivery levels across the two paths.
- The lowest cost fit is duplicated delivery levels across the two paths.
- The lowest cost fit is assured delivery levels across the two paths.