Available options are as follows:

QUESTION a:

a.	EMPLOYEE.SUPERSSN references to EMPLOYEE.SSN EMPLOYEE.SUPERSSN references to EMPLOYEE.SSN
b.	EMPLOYEE.DNO references to DEPARTMENT.DNUMBER EMPLOYEE.SUPERSSN references to EMPLOYEE.SSN
c.	EMPLOYEE.DNO references to DEPARTMENT.DNUMBER DEPARTMENT.MGRSS references to EMPLOYEE.SSN
d.	DEPARTMENT.MGRSS references to EMPLOYEE.SSN EMPLOYEE.SUPERSSN references to EMPLOYEE.SSN

QUESTION b:

a.	EMPLOYEE.DNO references to DEPARTMENT.DNUMBER
b.	DEPARTMENT.MGRSS references to EMPLOYEE.SSN
c.	EMPLOYEE.SUPERSSN references to EMPLOYEE.SSN
d.	All of a, b, and c.

ease