We are designing a database for a nonprofit organization. The organization depends on a number of different types of persons for its successful operation. The organization is interested in the following attributes for all of these persons: SSN$,$ Name, Address$($City$/$State$/$Zip$),$ and Telephone. Three types of persons are of greatest interest: employees, volunteers, and donors. Employees have only a Date$\_$ Hired attribute, and volunteers have only a Skill attribute, and some volunteers may have more than one skills. Donor have a Donation$\_$Type attribute. There are persons other than employees, volunteers, and donors who are of interest to the organization so that a person need not belong to any of these three groups. On the other hand, at a given time a person may belong to two or more of these groups $($e$.$g$.,$ employee and donor$).$ Donors have only a relationship with an Item entity. Item entity has the following attributes: item ID$,$ item Description. A donor can donated many items, and need to donate at least one item. An item may be donated by many donors, some item may have no donors.