Ppose we want to develop software for an PLANNER. user planner should record events, give alarm, and connect to an email. Consider all updat at can be done to and for an event. Events can give an alarm based on the user preference. A. Identify the top-level functional requirement for the planner, and model it with a use case diagr B. Assume that 'set alarm' is one of your use cases. Complete its description (i.e. frame details)