The diagram below shows the Observer Pattern in its abstract form. Explain the intent and motivation of this pattern Subject Observer attach Observer) deatach(Observer) notify0 update0 ConcreteSubject ConcreteObserver update0 observerState getState0 setState0 subjectState The diagram below shows the Observer Pattern in its abstract form. Explain the intent and motivation of this pattern Subject Observer attach Observer) deatach(Observer) notify0 update0 ConcreteSubject ConcreteObserver update0 observerState getState0 setState0 subjectState