Identify possible objects in the following system and develop an object-oriented design for them. You may make reasonable assumptions about the systems when deriving the design. A group calendar and time management system is intended to support the scheduling 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 schedules and arranges the appointment for that time. If no common slots are available, it interacts with the user to rearrange his or her personal schedule to make room for the appointment.