A group diary and time management system is intended to support the timetabling of meetings and appointments across a group of co-workers. When an appointment is to be made that involves a number of people, the system finds a common slot in each of their diaries and arranges the appointment for that time. If no common slots are available, it interacts with the user to rearrange his or her personal diary to make room for the appointment.

Your task is to determine whether the Publisher-Subscriber design pattern can be applied in this design. Explain clearly your answer. If the answer is yes, identify which classes are suitable for the publisher role and which ones are suitable for the subscriber role. Explain your choices, list the events generated by the Publishers, and state explicitly for each Subscriber to which events it is subscribed to.