a) Which relational algebra expression corresponds to the query Find the names and cities of residence of all employees who work for "First Bank Corporation"? nerme city (employee (compe=First Bank Corporation (works) nem, street, city (companyame="First Blank Corporation" wlery > 10000) (works X employee)) b) Teretneme (compenwume = "First Bank Corporation" (works)) d) It is not possible to express this query in relational algebra. c) 14) Nulis may be used in a database table when an actual value is either unknown or does not exist (True) 15) Projection is a relational operator that extracts specified from a relation a) columns b) rows c) cells d) views 16) Which query creates a projection of the depName and locID columns from the Departments table? a) SELECT depName, locID FROM Departments; b) SELECT DISTINCT depName, locID FROM Departments; c) SELECT depName, locID FROM Dept; d) SELECT dep Name AS "locID" FROM Departments; 17) The Salary column of the EMPLOYEES table has a data type of NUMBER(8,2). Which Salary value will not be permitted in this column? a) 12345678 b) 123456.78 c) 123456 d)12.34