Question 1: Relation Algebra (15 marks) Specify the following queries on the COMPANY relational database schema EMPLOYEE Fname Minit Lname Ssn Bdate Address Sex Salary Super ssn Dno DEPARTMENT Dname Dnumber Mgr ssn Mgr start_date DEPT LOCATIONS DnumberDlocation PROJECT Pnumber Ploc ation Dnum WORKS ON Essn Pno Hours DEPENDENT Essn Dependent_name Sex Bdate Relationship (a) Retrieve the names of employees in department 5 who work more than 10 hours per week on the 'ProductX' project