Brenna believed her backyard ran all the way to a fence. Actually, a strip on Brenna's side of the fence really belonged to her neighbor – his majesty – Steven Fichera. Brenna never intended to take the land away from anyone. Brenna later brought an action against Steven to determine who owned the strip on Brenna’s side of the fence. What does Brenna need to prove in order to show she is the owner of this strip of land?