For a Flow to trigger effectively, what must be present?

For a Flow to trigger effectively, a trigger is essential. Triggers define the conditions under which the Flow will start executing. They can be based on various events such as record creation, updates, or other specified criteria. Without a trigger, the Flow has no mechanism to know when to initiate, rendering it inactive and ineffective for automating tasks or processes.

The other options, while they can be part of a broader workflow or business process, do not serve the fundamental purpose of initiating a Flow. For example, a scheduled time can determine when a Flow runs but is not necessary for all types of Flows. An action button might prompt user interaction but again does not serve as a fundamental trigger across all scenarios. An approval process may be a step within a Flow, but on its own, it does not cause the Flow to start. Thus, the critical component needed for a Flow to function is indeed the trigger.