Which statement is true about trigger and impacted nodes?

A.
The trigger node starts a timer event; the impacted node receives the results from the event.

B.
The trigger node defines the impact; the impacted node shows how many nodes are impacted.

C.
The trigger node is the starting point for the impact rule; the affected node is the root cause.

D.
The trigger node is the cause; the impacted node is the effect in a cause and effect relationship.