A. Given the following database schema E Employee (Ename, SSN, Age, salary, Supervisor_SSN, Dno) D Department (Dname, Dnumber, Dlocation, Manager_SSN, MgrStartingDate) P- Project (Pname, Pnumber, Plocation) W-Works On (ESSN. Pno, Hours) De Dependent (ESSN D name, DoB, Relationship) and the following set of foreign keys: Employee-Supervisor. SSN EmployeeSSN Employee,Dno Department,Dnumber Department,Manager-SSN EmployeeSSN Works-ON.ESSN Employee.SSN works-On.Pno ProjectPnumber Dependent.ESSN Employee.SSN Write the following queries in relational algebra