The correct answer is Rule conditions, Event triggers, and Action steps.

Event triggers determine when an automation rule starts by detecting the occurrence of a specific event or schedule. Triggers are the entry point for a rule and they tell the system to evaluate the rule whenever the defined event happens.

Rule conditions are used after a trigger to decide whether the rule should continue. Conditions filter the incoming events so that actions only run when the issue or event meets the required criteria.

Action steps are the tasks the rule performs when its conditions pass. Actions make changes such as editing an issue field, transitioning the issue, sending notifications, or calling external services.

Cloud Pub/Sub is a Google Cloud messaging service and it is not an element that composes Jira Cloud automation rules.

Workflow validators are part of Jira workflow transitions and they enforce constraints at transition time. They are not the same as automation rule conditions and they do not define triggers or action steps in automation rules.

Event listeners are a different mechanism that can respond to events at the application level. Jira Cloud automation uses triggers rather than low level listeners, so listeners are not listed as the core elements of an automation rule.

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