Explain the difference between overriding and overloading a member function of a base class in a derived class. (3) Suppose class two is derived from class one. To avoid multiple inclusion of these...

Explain the difference between overriding and overloading a member function of a base class in a derived class. (3)

Suppose class two is derived from class one. To avoid multiple inclusion of these classes, which preprocessor directives are used in the header files containing the definitions of these classes. Justify your answer by giving an example. (7)