Specify the following queries on the database schema shown in the following figure, using the operations of the relational algebra. The homework assignment must be typed and submitted in a PDF format to Canvas EMPLOYEE DEPARTMENT DEPT LOCATIONS OLOCATION PROJECT WORKS ON ESSN PNOHOURS DEPENDENT ESSN DEPENDENT NWME SEX BDATE RELATIONSHIP (3) Retrieve the names of employees (lname, fname) in department 8 who work more than 10 hours per week on the 'RD' project. ("RD" is the project name.) 4) Find the names of employees (Iname, finame) who are directly supervised by "Mary