Question: Given the two entities below, the foreign key is what? DEPARTMENT ( DepartmentName , BudgetCode, ManagerName ) EMPLOYEE ( EmployeeNumber , EmployeeLastName, EmployeeFirstName, DepartmentName )

Given the two entities below, the foreign key is what?
DEPARTMENT(DepartmentName, BudgetCode, ManagerName)
EMPLOYEE(EmployeeNumber, EmployeeLastName, EmployeeFirstName, DepartmentName)
a. DepartmentName in the DEPARTMENT entity
b.[EmployeeNumber, DepartmentName]
c. EmployeeNumber in the EMPLOYEE entity
d. DepartmentName in the EMPLOYEE entity

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