3. (15 points) Use the ER diagram of a company database system below to answer the following questions: Frame Minit Lramo BduleName Address Salary San / Sex WORKS FORAN Name Number Department Startdate Number of employee EMPLOYEE DEPARTMENT Department Controlling Managed (1,1) Department MANAGES CONTROLS 11.1 Employee IN Hours Controlled (1,1) Project PROJECT Supervisor WORKS ON (1.NO SUPERVISION Employee Location >> 6.0 Dependent DEPENDENT Mere Sa B irth date Relationship (a) (5pts) List the strong (nonweak) entity types in the ER diagram (b) (5pts) Is there a weak entity type? If so, give its name, its partial key, and its identifying relationship. What constraints do the partial key and the identifying relationship of the weak entity type specify in this diagram? (c) (5pts) For EMPLOYEE entity, which attribute is composite? Which attribute(s) is the key? Specify the (min, max) constraint on each participation of an entity type in the WORS_FOR relationship