which column in the Employee table should you a create a self-reference foreign key constraint?

You administer a Microsoft SQL Server 2012 database. The database contains a table
named Employee.
Part of the Employee table is shown in the exhibit. (Click the Exhibit button.)

Unless stated above, no columns in the Employee table reference other tables.
Confidential information about the employees is stored in a separate table named
EmployeeData. One record exists within EmployeeData for each record in the Employee table.
You need to assign the appropriate constraints and table properties to ensure data integrity
and visibility.
On which column in the Employee table should you a create a self-reference foreign key
constraint?

A.
DateHired

B.
DepartmentID

C.
EmployeelD

D.
EmployeeNum

E.
FirstName

F.
JobTitle

G.
LastName

H.
MiddleName

I.
ReportsToID