12. Make a design class model for the Computer Assignment System (described previously) that has Computer and User classes (at least). Design the interaction that occurs when a computer is assigned to a assignment is made using computer and user user. Assume that an identifiers. If an assigned computer is already assigned to some other user, then the old assignment is destroyed A group of system administrators must to computer users in the community they support. A planned Computer Assignment System (CAS) will keep track of computers, computer users, and assignments. Developers in the same enterprise will implement CAS keep track of computers assigned Computer Assignment System (CAS) The major stakeholders are System Administrators, the Computer Users, the CAS Developers, Accountants, and the Managers of the development group and the system administration group. CAS has the following business goals: Three people develop CAS in three months or less must CAS must require no more than one person-week per year for maintenance. CAS must maintain the location, components, operational status, purchase date, and assignment of every computer in the organization. CAS must maintain the name, location, and title of every computer user in the organization CAS users must take no more than an average of one minute per transaction to maintain this information. Managers need CAS to meet its business requirements. Managers will not use CAS directly.