Map the following ER diagrams into the most efficient relational database schema: (ON) (1,1) Employee has Dependent frame Bdate 830 Ename Select one O a Employee (ssn, ename), Dependent (fname Bdate) O b. Employee (ssn, ename), Dependent (fname Bdate, employee_ssn) O c. Employee (ssn ename), Dependent (fname Bdate), has (employee_ssn, dependent_fname O d. Employee (ssn, ename, dependent_fname). Dependent (fname, Bdate)