If 2 classes derive one base class and redefine a function of base class, also overload some operators inside class body. Among these two things of function and operator overloading, where is polymorphism used?

• A. Function overloading only
• B. Operator overloading only
• C. Both of these are using polymorphism
• D. Either function overloading or operator overloading because polymorphism can be applied only once in a program