Is this correct?

What does the "C indicate in the ERD below? Employee EmpNo EmpName EmpGender EmpDOB EmpPhone EmpHireDate EmpMail Faculty FacRank FacPayPeriods FacTenure Administrato AdmTitle AdmContractLength AdmAppointmentDate An employee cannot be both a faculty member and an administrator A faculty member is not an employee Faculty members and administrators are the only types of employees in the system OAn employee is a sub-type of administrator None of the above