3. (15 points) Use the ER diagram of a company datab questions: abase system below to answer the following Frame Minit name Bdute Name Address Salary Sun Sex WORKS FOR 6410 Employee Startdate Number of employer DEPARTMENT Department Controlling Manager A M 0 3) Department MANAGES Name Number Departe CONTROLS (IN Works ONO Supervisor Supervise Controlled (1.1) Project PROJECT WORKS_ON Project " SUPERVISION 10.NO Employee Location > (1,1) Dependent DEPENDENT Name Sex Birth_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 attributes key? Specify the (min, max) constraint on each participation of an entity type in ti WORS_FOR relationship