You are creating a class named Employee. The class exposes a string property named EmployeeType. The following code segment defines the Employee class. (Line numbers are included for reference only.) The EmployeeType property value must be accessed only by code within the Employee class or within a class derived from the Employee class and modified only by code within the Employee class. You need to ensure that the implementation of the EmployeeType property meets the requirements. Which two actions should you perform? (Each correct answer represents part of the complete solution. Choose two.)