Use relational algebra to express this query using the symbols above: Attachment 1Attachment 2Attachment 3Depts(dID, dName, budget)Gives the departments, their ID, name andd stands for department. budget. EmployeesfelD. dID, eName, eSalary)Gives the employees, their IDs, where theye stands for employee work, their names and salaries. Suppliers(sID, sName, sCity, sState, elD)Gives the suppliers, their IDs, their namess stands for supplier. And where they are located (city and state).Also tells which employees are contact persons for the suppliers. Items(sID. siCode, dID, iName, MSRP)Gives the items and the departments that selli stands for item, siCade stands for supplier-the items. MSRP=manufacturer suggested assigned item code. Retail price.