Q.2. Using the database schema shown below and relational algebra operators (ONLY) design the following queries, (a)List names of all the projects that are controlled by the department named Rescarch. (b)List last names of all the employees who work in the department that is managed by an employee whose last name is Wong EMPLOYEE Fname Minit Lname Ssn Bdate Address Sex Salary Super_ssn Dno DEPARTMENT Dname Dnumber Mgr ssn Mgr start date DEPT LOCATIONS PROJECT PnamePnumber Plocation Dnum WORKS ON Essn Pno Hours DEPENDENT Essn Dependent nameSex Bdate Relationship