Specify the following queries on the database schema shown in the following figure, using the operations of the relational algebra.

Specify the following queries on the database schema shown in the following figure, using the operations of the relational algebra. | EMPLOYEE FNAME MINIT NAME SSN BDATE ADDRESS SEX SALARY SUPERSSN DNO DEPARTMENT DNAMEDNUMBER MGRSSN MGRSTARTDATE DEPT LOCATIONS DNUMBER DLOCATION PROJECT PNAME PNUMBER PLOCATION DNUM WORKS ON PNO HOURS DEPENDENT ESSN DEPENDENT NAME SEX BDATE RELATIONSHIP (1) Retrieve the names (fname, Iname) of employees in department 1 who work less than 11 hours per week on the 'River' project. ("River" is the project name.) (2) List the name (fname, Iname) of the direct supervisor of John Smith (3)List the name (fname, Iname) of the manager of department 1 (4) List the name (fname Iname) of male dependents, if the dependents depend on an employee who works for the 'EEE' department. ('EEE, is department name)