Which statement about the Exit subflow action is true?

The statement that it isn't necessary at the end of each subflow is correct because subflows in Power Automate are designed to conclude automatically once they reach the last action in the subflow. There is no requirement to explicitly use an Exit subflow action; doing so is optional. This design allows for a more streamlined process, as the subflow will return control to the calling flow immediately upon completion of its defined actions. This flexibility facilitates smoother flow transitions and can simplify the development of automations.

Other statements suggest mandatory usage of the Exit subflow action, whereas it is not needed for closure, or imply limitations on the context in which subflows work, which do not accurately reflect their operational behavior.