I)Event bus, event producer, event consumer, and event builder II)Event producer and event consumer III)Event producer, event consumer, and Apex trigger IV)Event producer, event consumer, event, event message, event channel, and event bus V)Platform events [bg_collapse view="button-orange" color="#4a4949" expand_text="Show Answers" collapse_text="Close Answer" ] IV)Event producer, event consumer, event, event message, event channel, and event bus [/bg_collapse]