Which of the following is used to initiate a flow?

A trigger defines when a flow should start, such as when a record is created or updated, on a schedule, or when an application event occurs.

A Core Action is a reusable operation within a flow, but it does not initiate the flow itself; it performs a specific task once the flow has started.

A spoke is a collection of related actions, subflows, and flow templates for a particular application or integration, not something that initiates a flow.

While an event can be a *type* of trigger, 'An Event' itself is not the specific Flow Designer component used to *initiate* the flow; the trigger *uses* the event.